add css
Add style and level choser dialog. Add two new styles.
create new branch
Merge branch 'master' of https://github.com/AndreyMlashkin/RoofGenerator

Conflicts:
	roof_proj.pro
Merge branch 'master' of https://github.com/AndreyMlashkin/RoofGenerator

Conflicts:
	mainwindow.cpp
change charset