improve compile performance by minimizing headers
make codebase compatible with qt4
Merge remote-tracking branch 'upstream/DF2014' into qt4-compat-clean

Conflicts:
	src/grid_view/healthcolumn.cpp
Make QML/QtScript inclusion conditional on version

Conflicts:
	dwarftherapist.pro
Merge remote-tracking branch 'upstream/DF2014' into qt4-compat-clean
add missing include for windows