Abstracted lower level drawing code, moved all type-specific drawing code out of opengl backend, deleted obsolete files

--HG--
branch : minor

src/modules/graphics/Text.h

@@ -66,7 +66,7 @@ public:
 	// Implements Drawable.
 	void draw(love::graphics::Graphics *gfx, const Matrix4 &m) override;
 
-protected:
+private:
 
 	struct TextData
 	{
@@ -83,8 +83,6 @@ protected:
 	void regenerateVertices();
 	void addTextData(const TextData &s);
 
-	virtual void drawInternal(const std::vector<Font::DrawCommand> &commands) const = 0;
-
 	StrongRef<Font> font;
 
 	vertex::Attributes vertexAttributes;