improved rounded corners for main and taskEditor windows.
rounded corners for settings window
setting style for archive window
added comboBox to styles, started with window modality
Completed(probably not) stylesheet for whole program, new options in
settings window. Fixed too small ui elements. created new icons and
generated new resources file.
Included newly created icons
Icon for QSizeGrip, rounded corners problem should be fixed now.
read tasklistFont size..
resizable taskEditor window.
Merge branch 'master' into translate

Conflicts:
	lib/GuiManager.py
	lib/task.py
	main.py
	res_rc.py
Updated polish translation