Jeck - Cache and resource manager merged, streamlined.

This is pretty major, so there'll probably be something wrong with it... even though I did spend a few hours looking.
NOTES:
 * If you've Retrieved it, don't delete it--- Use resources.Release(Whatever). 
    Textures automatically release subordinate quads.
 * Most of the time, use resources.RetrieveQuad to grab a quad. Should handle everything for you.
    RetrieveQuad will load the required texture, if needed.
    Only managed resources have a resource name ("back", "simon", etc). 
    Managed resources can be retrieved with GetTexture/GetQuad/GetWhatever.
    Non managed quads lookup by position/dimensions, defaulting to the whole texture.
 * Use resources.RetrieveTexture only when you need to do something special to it. 
    Calling retrieve texture with RETRIEVE_MANAGE will permanently add a texture to the manager
    RETRIEVE_LOCK and RETRIEVE_VRAM will lock a texture. It will not leave the cache until
    Release(JTexture*) is called, or as a last resort during cache overflow.
 * Try to only store (as a class member) pointers to textures retrieved with RETRIEVE_MANAGE. 
    All others may become invalid, although locked textures do have a high degree of stability. It's
    pretty safe to store a locked texture if you're not going to load much between uses.

There's a lot going on here, so I might have missed something... but it runs through the test suite alright.

TODO: 
 * When called without any arguments, RetrieveQuad sometimes leaves a thin border around the image. 
    This can be bypassed by specifying a quad one or two pixels less than the image size. Why?
 * I've had a crash while runing the Demo mode, something to do with receiveEventMinus? 
    This hasn't exactly reproduced on a clean SVN copy, (being a hang, rather than a crash) so 
    I've probably done something to worsen the problem somehow? I'll look into it tomorrow.
 * Clean up lock/unlock system, memory usage. Streamline interface, consider phasing out calls using GetWhatever() format.

JGE/include/JResourceManager.h

@@ -26,8 +26,6 @@ using namespace std;
 #define INVALID_ID				-1
 
 class JRenderer;
-class JParticleEffect;
-class JMotionEmitter;
 class JSample;
 class JMusic;
 class JTexture;
@@ -38,33 +36,30 @@ class JResourceManager
 {
 public:
 	JResourceManager();
-	~JResourceManager();
+	virtual ~JResourceManager();
 
 	//void SetResourceRoot(const string& resourceRoot);
 	bool LoadResource(const string& resourceName);
 
 	void RemoveAll();
-	void RemoveGraphics();
-	void RemoveSound();
-	void RemoveFont();
 	
-	int CreateTexture(const string &textureName);
+	virtual int CreateTexture(const string &textureName);
 	JTexture* GetTexture(const string &textureName);
 	JTexture* GetTexture(int id);
 
-	int CreateQuad(const string &quadName, const string &textureName, float x, float y, float width, float height);
+	virtual int CreateQuad(const string &quadName, const string &textureName, float x, float y, float width, float height);
 	JQuad* GetQuad(const string &quadName);
 	JQuad* GetQuad(int id);
 
-	int LoadJLBFont(const string &fontName, int height);
+	virtual int LoadJLBFont(const string &fontName, int height);
 	JLBFont* GetJLBFont(const string &fontName);
 	JLBFont* GetJLBFont(int id);
 
-	int LoadMusic(const string &musicName);
+	virtual int LoadMusic(const string &musicName);
 	JMusic* GetMusic(const string &musicName);
 	JMusic* GetMusic(int id);
 
-	int LoadSample(const string &sampleName);
+	virtual int LoadSample(const string &sampleName);
 	JSample* GetSample(const string &sampleName);
 	JSample* GetSample(int id);
 
@@ -76,7 +71,7 @@ public:
 // 	JMotionEmitter* GetMotionEmitter(const string &emitterName);
 // 	JMotionEmitter* GetMotionEmitter(int id);
 
-private:
+protected:
 
 	//JRenderer *mRenderer;