(svn r10092) -Codechange: code-seperated the spriteloader and blitter from the rest of the code

-Add: make it possible to pick your own blitter (-b <blitter>, -h for overview)
-Add: added a new optimized 8bpp blitter (default, caches sprites of all zoom-levels)
-Add: added a debug 8bpp blitter and a very slow normal 8bpp blitter

src/blitter/8bpp_debug.hpp

@@ -0,0 +1,30 @@
+/* $Id$ */
+
+/** @file debug.hpp */
+
+#ifndef BLITTER_8BPP_DEBUG_HPP
+#define BLITTER_8BPP_DEBUG_HPP
+
+#include "blitter.hpp"
+
+typedef Pixel Pixel8;
+
+class Blitter_8bppDebug : public Blitter {
+public:
+	uint8 GetScreenDepth() { return 8; }
+
+	void Draw(Blitter::BlitterParams *bp, BlitterMode mode, ZoomLevel zoom);
+
+	Sprite *Encode(SpriteLoader::Sprite *sprite);
+};
+
+class FBlitter_8bppDebug: public BlitterFactory<FBlitter_8bppDebug> {
+public:
+	/* virtual */ const char *GetName() { return "8bpp-debug"; }
+
+	/* virtual */ const char *GetDescription() { return "8bpp Debug Blitter (testing only)"; }
+
+	/* virtual */ Blitter *CreateInstance() { return new Blitter_8bppDebug(); }
+};
+
+#endif /* BLITTER_8BPP_DEBUG_HPP */