Kernel: Implement TerminalDriver for Framebuffer device

Use this new FramebufferTerminalDriver for terminal instead of the
old VesaTerminalDriver. Only drawback with this is that framebuffer
device can only be intialized after DevFS is initialized.

kernel/CMakeLists.txt

@@ -64,6 +64,7 @@ set(KERNEL_SOURCES
 	kernel/Storage/StorageDevice.cpp
 	kernel/Syscall.cpp
 	kernel/Syscall.S
+	kernel/Terminal/FramebufferTerminal.cpp
 	kernel/Terminal/Serial.cpp
 	kernel/Terminal/TTY.cpp
 	kernel/Terminal/VesaTerminalDriver.cpp