Commit to add "Coverage" option to procedural terrain generator

This commit adds a "Coverage" option to the procedural terrain
generator. Allows mixing of textures. See
http://www.garagegames.com/community/blogs/view/22371 for more info.
This version has many improvements - coverage is now entered as a
percentage, accepts decimals, and doesn't have any bugs as far as I
know.
followup to https://github.com/GarageGames/Torque3D/issues/393
editor default and retrieval values for particle emitter ejectionOffsetVariance (sets the sliderbars and text from memory when reloading an emitter DB)
Added support for large lists of shape formats. Needed for assimp.
Increased stability Torqu3D: unit-tests running without a crash. See the console.log after ran unitTest_runTests( "", true ). @signmotion
Don't assign NULL to a Vector.
Move CMake library's files to libraries dir.
Clean CMake files.
CMake changes for dedicated builds.
Fix for error on Clang compiler: reinterpret_cast from 'const void *' to 'FunctionType *' (aka 'void (*)(EngineObject *, const char *, const char *)') casts away qualifiers
         return R( reinterpret_cast< FunctionType const* >( /*const_cast<void*>*/(mFn) )( mThis, a, b ) );
Fix error on Clang compiler: 'ival' is a protected member of 'Dictionary::Entry'
Merge remote-tracking branch 'JackDavidson/master' into procedural-terrain-coverage
Fix random number generation.
Vehicle gamepad fix for full template.
Use fixed buffer size var when allocating return buffer from console.

Conflicts:
	Engine/source/T3D/missionArea.cpp
	Engine/source/gui/editor/guiDebugger.cpp
Merge pull request #652 from just-bank/fixed-buf-size

Use fixed buffer size variable for allocating return buffer
Merge pull request #688 from rextimmy/vehicle_gamepad_fix

Vehicle gamepad fix for full template.
Merge pull request #687 from eightyeight/procedural-terrain-coverage

Add coverage option to procedural terrain generator
Merge pull request #681 from BeamNG/fix_cmake_linux_dedicated

Fix CMake linux dedicated on gcc and Clang
Merge pull request #674 from eightyeight/fix-tsignal-mtriggernext

Fix SignalBase constructor shenanigans