improve code completions

src/SharpIDE.Godot/Features/CodeEditor/SharpIdeCodeEdit.tscn

@@ -37,6 +37,7 @@ gutters_draw_breakpoints_gutter = true
 gutters_draw_executing_lines = true
 gutters_draw_line_numbers = true
 code_completion_enabled = true
+code_completion_prefixes = Array[String]([".", " "])
 auto_brace_completion_enabled = true
 auto_brace_completion_highlight_matching = true
 script = ExtResource("2_kp2fd")