* gge::os::filesystem::LocateResource

* ToLower, ToUpper string functions

* ImportWave function now returns success or failure message using SoundReadError enumeration

* Image import now properly gives error for unknown image type

* GCC fixes

* Fixed compile errors in MovingListOrganizer

* TrimLeft, TrimRight functions

* shader files from previous commit

* modifications to accommodate per-pixel lighting

* formatting and cleanup from commented out code

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