Fix flame thrower model (Linux), flash, ammo, and explosion

Convert TGA to tga in flamethrower.md3 so it works on Linux (case sensitive) when data is not zipped.
Add flame thrower muzzel flash shader to it doesn't have a black background (copied machine gun's flash shader).
Fix flame thrower using BFG ammo model name in code/game/bg_misc.c.
Fix flame thrower ammo shader (filename typo).
Fix flame explosion in code/cgame/cg_weapons.c.
Rename gfx/color/black.tga to gfx/colors/black.tga like explosion (and other) shaders expect.

baseq3r/scripts/ammo.shader

@@ -202,7 +202,7 @@ models/powerups/ammo/flameammo
 models/powerups/ammo/flameammo2
 {
 	{
-		map models/powerups/ammo/flmeammo2.tga
+		map models/powerups/ammo/flameammo2.tga
 		rgbGen identity
 	}
 }

baseq3r/scripts/weapon_flamethrower.shader

@@ -0,0 +1,10 @@
+models/weapons2/flamethrower/f_flamethrower
+{
+	cull disable
+	{
+		clampmap models/weapons2/flamethrower/f_flamethrower.tga
+		blendfunc add
+		rgbGen identity
+		tcMod rotate 5288
+	}
+}

engine/code/cgame/cg_weapons.c

@@ -2029,6 +2029,7 @@ void CG_MissileHitWall( int weapon, int clientNum, vec3_t origin, vec3_t dir, im
 		sfx = cgs.media.sfx_plasmaexp;
 		mark = cgs.media.burnMarkShader;
 		radius = 16;
+		isSprite = qtrue;
 		break;
 // Q3Rally Code END
 

engine/code/game/bg_misc.c

@@ -620,7 +620,7 @@ gitem_t	bg_itemlist[] =
 {
 	"ammo_flame",
 	"sound/misc/am_pkup.wav",
-	{ "models/powerups/ammo/bfgam.md3", 
+	{ "models/powerups/ammo/flameam.md3", 
 	NULL, NULL, NULL},
 /* icon */ "icons/icona_flame",
 /* pickup */	"Flame Ammo",