- Linting (ESLint): Stricter rules (or switch to warning)

- Breaking internal API change: `updateGripCursor` moved to be class method of Selector rather than instance method
- Breaking internal API change: `subpathIsClosed` moved to be class method of `Path` rather than instance method
- Refactoring: Reuse utilities base64 encoder for SVG icons plugin
- Docs (JSDoc): Fix return of the `mouseUp` (can also be an object) and `mouseDown` (may also be a boolean) of `pathActions`; other JSDoc additions/improvements

test/math_test.js

@@ -20,9 +20,9 @@ QUnit.test('Test svgedit.math package', function (assert) {
   assert.ok(math.transformPoint);
   assert.ok(math.isIdentity);
   assert.ok(math.matrixMultiply);
-  assert.equal(typeof math.transformPoint, typeof function () {});
-  assert.equal(typeof math.isIdentity, typeof function () {});
-  assert.equal(typeof math.matrixMultiply, typeof function () {});
+  assert.equal(typeof math.transformPoint, typeof function () { /* */ });
+  assert.equal(typeof math.isIdentity, typeof function () { /* */ });
+  assert.equal(typeof math.matrixMultiply, typeof function () { /* */ });
 });
 
 QUnit.test('Test svgedit.math.transformPoint() function', function (assert) {