#5 dynamic light support

[Te'ja]

patch adds a 'light' object with full ogre & lua
functionality and appropriate functions for creating and
destroying lights to graphicsSystem .

I think the appropriate files/changes are included, but
at this point my copy of oasis is mighty different from
cvs and I certainly could have missed something ...

Changes oasisGraphicsSystem.h and
oasisGraphicsSystem.cpp
Adds oasisLight.h and oasisLight.cpp (which must be
manually added to the build)

[Nobody/Anonymous]

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It works perfectly (by _jones)

[Te'ja]

plugs memory leaks

[Te'ja]

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user_id=737159

awesome =)

updated this to delete the light objects in th' graphicssystem
destructor (oops! heh)