Start refactoring UI module structure
Add vim wrapper class with tests
Refactor UI class to not call vim module directly
Merge branch 'dev' into refactor

Conflicts:
	plugin/python/vdebug/ui/vimui/window.py
Merge branch 'dev' into refactor

Conflicts:
	plugin/python/vdebug/ui/vimui/window.py
Change module names for window renderers