Patch for /trunk/GPTP/src/SCBW/scbwdata.h #31

Changes to access units colors and players colors.
Involve changes in scbwdata.h, graphics.h, CUnit.cpp, CUnit.h and 
enumerations.h.
In my local version, I also removed the PLAYER structure from structures.h to 
put it in two files, Player.h and Player.cpp, so that I can add a getColor() 
function to get a player color, but I can't add files to the project, so I 
won't add this.