arcing projectiles

curvature should start at (1.73 / sqrt(sqrt(70.0 / 10.0)) = 1.06358350461)
rather than 0.5 for arcing shots, as strength and weight are assumed to be
70 and 10 respectively
Xcom1Ruleset: complete the list of Hobbes' terrains for music calls.

en-US: change "Destination" to "ENROUTE"

TileEngine: refactor validateThrow()
Inventory: make CTRL clicks work the way I want.

Merge branch 'master' of https://github.com/SupSuper/OpenXcom into oXc_kL
Conflicts:
	src/Battlescape/TileEngine.cpp