Kernel: VESA driver has now second buffer for fast scrolling

This allows us to not read from video memory, since it was very slow

I also implemented fast path for graphics clearing and scrolling if bpp is 32

kernel/include/kernel/VESA.h

@@ -25,10 +25,11 @@ namespace VESA
 		BRIGHT_WHITE = 15,
 	};
 
-	bool Initialize();
+	bool PreInitialize();
+	void Initialize();
 	void PutEntryAt(uint16_t, uint32_t, uint32_t, Color, Color);
 	void Clear(Color);
-	void ScrollLine(uint32_t line);
+	void Scroll();
 
 	uint32_t GetTerminalWidth();
 	uint32_t GetTerminalHeight();

kernel/include/kernel/kmalloc.h

@@ -5,6 +5,7 @@
 void kmalloc_initialize();
 void kmalloc_dump_nodes();
 
+void* kmalloc_eternal(size_t);
 void* kmalloc(size_t);
 void kfree(void*);