Added the following replacement functions for compliance to the OSSL standards stated on the wiki:
osGetTerrainHeight
osSetTerrainHeight
osGetSunParam
osSetSunParam
osSetPenColor
The functions that do not comply to the standard give a warning when used but work normally otherwise.
The graphics primitive drawing command "PenColor" has also been added as well as dynamic texture parameter "bgcolor" as an alternative to "bgcolour".
The following two functions have been renamed because they are not enabled yet aynway:
osWindParamSet => osSetWindParam
osWindParamGet => osGetWindParam
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