Some changes to column resizing behavior

Conflicts:
	You-GUI/main_window.cpp
Exits by Alt F4 or clicking X

Conflicts:
	You-GUI/main_window.cpp
Avoid merge conflict.

Conflicts:
	You-GUI/main_window.cpp
Some documentation.

Conflicts:
	You-GUI/main_window.cpp
	You-GUI/task_panel_manager.h
Fixed minimize.
Rebase fix
Merge pull request #376 from angathorion/column-sizing

Column sizing