(INCOMPLETE: ES6 Module conversion and linting)

- Breaking change: Require `new` with `EmbeddedSVGEdit` (allows us to use `class` internally)
- Breaking change: If `svgcanvas.setUiStrings` must now be called if not using editor in order
    to get strings (for sake of i18n) (and if using path.js alone, must also have its `setUiStrings` called)
- Breaking change (ext-overview-window): Avoid global `overviewWindowGlobals`
- Breaking change (ext-imagelib): Change to object-based encoding for namespacing of
    messages (though keep stringifying/parsing ourselves until we remove IE9 support)
- Breaking change: Rename `jquery.js` to `jquery.min.js`
- Breaking change: Remove `scoped` attribute from `style`; it is now deprecated and
    obsolete; also move to head (after other stylesheets)
- Enhancement: Make SpinButton plugin independent of SVGEdit via
    generic state object for tool_scale
- Enhancement: Remove now unused Python l10n scripts (#238)
- Enhancement: ES6 Modules (including jQuery plugins but not jQuery)
- Enhancement: Further JSDoc (incomplete)
- Enhancement (Optimization): Compress images using imageoptim (and add
    npm script) (per #215)
- Fix: i18nize path.js strings and canvas notifications
- Fix: Attempt i18n for ext-markers
- Refactoring (ext-storage): Move locale info to own file imported by the extension (toward modularity; still should be split into separate files by language and *dynamically* imported, but we'll wait for better `import` support to refactor this)
- Refactoring: For imagelib, add local jQuery copy (using old 1.4.4 as had
    been using from server)
- Refactoring: For MathJax, add local copy (using old 2.3 as had been using from
    server); server had not been working
- Refactoring: Remove `use strict` (implicit in modules)
- Refactoring: Remove trailing whitespace, fix some code within comments
- Refactoring: Expect `jQuery` global rather than `$` for better modularity
    (also to adapt line later once available via `import`)
- Refactoring: Prefer `const` (and then `let`)
- Refactoring: Add block scope keywords closer to first block in which they appear
- Refactoring: Use ES6 `class`
- Refactoring `$.isArray` -> `Array.isArray` and avoid some other jQuery core methods
    with simple VanillaJS replacements
- Refactoring: Use abbreviated object property syntax
- Refactoring: Object destructuring
- Refactoring: Remove `uiStrings` contents in svg-editor.js (obtains from locale)
- Refactoring: Add favicon to embedded API file
- Refactoring: Use arrow functions for brief functions (incomplete)
- Refactoring: Use `Array.prototype.includes`/`String.prototype.includes`;
    `String.prototype.startsWith`, `String.prototype.trim`
- Refactoring: Remove now unnecessary svgutils do/while resetting of variables
- Refactoring: Use shorthand methods for object literals (avoid ": function")
- Refactoring: Avoid quoting object property keys where unnecessary
- Refactoring: Just do truthy/falsey check for lengths in place of comparison to 0
- Refactoring (Testing): Avoid jQuery usage within most test files (defer script,
    also in preparation for future switch to ES6 modules for tests)
- Refactoring: Make jpicker variable declaration indent bearable
- Refactoring (Linting): Finish svgcanvas.js
- Docs: Mention in comment no longer an entry file as before
- Docs: Migrate old config, extensions, and FAQ docs
- Licensing: Indicate MIT is license type of rgbcolor; rename/add license file name for
    jgraduate and screencast to reflect type (Apache 2.0); rename file to reflect it
    contains license information (of type MIT) for Raphael icons

editor/config-sample.js

@@ -3,7 +3,6 @@
 //   CREATE A NEW FILE config.js AND ADD CONTENTS
 //   SUCH AS SHOWN BELOW INTO THAT FILE.
 
-/* globals svgEditor */
 /*
 The config.js file is intended for the setting of configuration or
   preferences which must run early on; if this is not needed, it is
@@ -19,6 +18,8 @@ See defaultConfig and defaultExtensions in svg-editor.js for a list
 See svg-editor.js for documentation on using setConfig().
 */
 
+import svgEditor from './svg-editor.js';
+
 // URL OVERRIDE CONFIG
 svgEditor.setConfig({
   /**
@@ -117,25 +118,23 @@ As with configuration, one may use allowInitialUserOverride, but
   Failing to use allowInitialUserOverride will ensure preferences
   are hard-coded here regardless of URL or prior user storage setting.
 */
-svgEditor.setConfig(
-  {
-    // lang: '', // Set dynamically within locale.js if not previously set
-    // iconsize: '', // Will default to 's' if the window height is smaller than the minimum height and 'm' otherwise
-    /**
-    * When showing the preferences dialog, svg-editor.js currently relies
-    * on curPrefs instead of $.pref, so allowing an override for bkgd_color
-    * means that this value won't have priority over block auto-detection as
-    * far as determining which color shows initially in the preferences
-    * dialog (though it can be changed and saved).
-    */
-    // bkgd_color: '#FFF',
-    // bkgd_url: '',
-    // img_save: 'embed',
-    // Only shows in UI as far as alert notices
-    // save_notice_done: false,
-    // export_notice_done: false
-  }
-);
+svgEditor.setConfig({
+  // lang: '', // Set dynamically within locale.js if not previously set
+  // iconsize: '', // Will default to 's' if the window height is smaller than the minimum height and 'm' otherwise
+  /**
+  * When showing the preferences dialog, svg-editor.js currently relies
+  * on curPrefs instead of $.pref, so allowing an override for bkgd_color
+  * means that this value won't have priority over block auto-detection as
+  * far as determining which color shows initially in the preferences
+  * dialog (though it can be changed and saved).
+  */
+  // bkgd_color: '#FFF',
+  // bkgd_url: '',
+  // img_save: 'embed',
+  // Only shows in UI as far as alert notices
+  // save_notice_done: false,
+  // export_notice_done: false
+});
 svgEditor.setConfig(
   {
     // Indicate pref settings here if you wish to allow user storage or URL settings