Replacing buttons with text by buttons with icons
Adding support for bitmap library to have a common API for icon request handling
Simplify wx controls and sizers creation in dialogs and custom controls and panels

To generate message.pot file:

	python mki18n.py -p --domain=PLCOpenEditor
	
To generate .mo files for all languages:

	python mki18n.py -m --moTarget=../locale --domain=PLCOpenEditor