Allow aircraft to be selectable from intercept window when out

Feature request 242
Compulsory adoption of new intercept screen
Make LMB consistently set destination in intercept screen
feature242 continued
Merge pull request #664 from keeper7478/master

Fix compile error
Merge branch 'feature242' of https://github.com/cfailde/OpenXcom

Conflicts:
	src/Menu/OptionsAdvancedState.cpp
cancel action on opening inventory or stats screen.

fixes some associated bugs.