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New features:
- add the following new modes:
- PyAutoCompleteMode
- CommentsMode
- DocumentAnalyserMode
- GoToAssignmentsMode
- add the following new panels:
- QuickDocPanel
- SymbolBrowserPanel
- CodeCompletion: provides method to interact with the subprocess interpreter
- CodeCompletion: preload hooks
- Add `Boostrapper` class to help start the code completion with a list of modules to
preload + example with a splash screen.
Fixed bugs:
- Disable actions which depends on preload
- Disable code completion in commente and strings
- Fix highlighting in docstrings (highlighting was lost when there was an '=' in the docstring.