cellGame, cellSysutil and TRP installer improved

* TRP Loader and sceNpTrophyRegisterContext improved.
* cellSysutil constants moved to cellSysutil.h
* cellGameBootCheck bug fixed that makes size->hddFreeSizeKB be 0.
* Added system language selector (this is *not* RPCS3's language).
cellSysutilGetSystemParamInt(0x111) will return the selected language.

NOTE: The problems caused by the last commit (pull request #104 merged)
are not yet fixed.