Update cmake files to fix OS X build issues

Updated OS X deployment target to 10.7 and set architecture to x86_64.
Also, removed existing unused code used to copy libraries for OS X from
CorsixTH and MapEdit cmake files and replaced with new code that
automatically bundles app up and includes them in the app. Added
the code to create a bundle to the AnimView cmake file. Finally, updated
the MapEdit cmake file to use the Lua find package code from the CorsixTH
cmake file, which includes a fix for OS X 64bit.
Merge pull request #420 from admdly/osx-build-fix

Fix for OS X build issues
Bump SAVEGAME_VERSION in preperation for 0.40-rc2
Merge pull request #424 from TheCycoONE/040rc2ver

Bump SAVEGAME_VERSION in preperation for 0.40-rc2