BGE internal cosmetic changes - Replacing hardcoded values with new defines

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The Rasterizer code was relying in the values defined on TF_ DNA files. I'm working in the recode of TexFace, bringing the options to the material panel and ran into those cases. They are hard to spot and add a lot of the "magic" effect to the code. Hardcoded values are at least easy to spot. We (still) have a few defines duplicated, relying on each other (a flag previously defined in the code is checked later on but using a different define (although with same value. (e.g. TF_BMFONT and RAS_RENDER_3DPOLYGON_TEXT). It's hell =)
I'm adding some comments to help on that.

Things will be revamped anyways, but it's nice to keep the code a bit more coherent before the real feature commit. That's all, thanks for listening.

source/gameengine/Rasterizer/RAS_IRasterizer.h

@@ -71,7 +71,7 @@ public:
 	/**
 	 */
 	enum	{
-			RAS_RENDER_3DPOLYGON_TEXT = 16384
+			RAS_RENDER_3DPOLYGON_TEXT = 16384	/* TF_BMFONT */
 	};
 	/**
 	 * Drawing types
@@ -106,7 +106,9 @@ public:
 	/**
 	 */
 	enum    { 	 
-			KX_TWOSIDE = 512, 	 
+			KX_TEX = 4,			/* TF_TEX */
+			KX_LIGHT = 16,		/* TF_LIGHT */
+			KX_TWOSIDE = 512,	/* TF_TWOSIDE */
 			KX_LINES = 32768 	 
 	};