Add alien containment management to game

Accessible by right clicking alien containment in base view.  Invoked
automatically if alienContainmentLimitEnforced is enabled and
containment limit is exceeded after a mission.
Add files to commit
Rename files
Centre ok button
More renaming and centering
Ensure available and used space does not include aliens under research
Merge branch 'master' into containmentManagement

Conflicts:
	bin/data/Language/en-US.yml
	src/CMakeLists.txt
Add additional strings to en-GB too
Alter containment management screen colors
CompilWarnings
New Advanced-Option: Psi-Strength Evaluation; Default: OFF
Evaluates the psionic strength of all soldiers after the appropriate research has been completed.
Updated Changelog
allow for limited shot weapons without clips.
EXPLOSIONS!!!1
Merge pull request #713 from starwindz/master

Cyclic animation of arrow above unit
Merge pull request #711 from fenyo1/psiStrengthEval

New Advanced-Option: Psi-Strength Evaluation; Default: OFF
Merge branch 'containmentManagement' of https://github.com/cfailde/OpenXcom

Conflicts:
	bin/data/Language/en-GB.yml
	bin/data/Language/en-US.yml
Merge pull request #709 from GixG/compilWarnings

Compil warnings
Compiler errors.
Refactored ruleset code. This has probably broken something, please test!
- Now you can remove entries by specifically specifying "delete: STR_ID".
- Added language fallback for extraStrings, defaults to English (or whatever's available) if target language isn't found.