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/include/kernel/Terminal/FramebufferTerminal.h

@@ -0,0 +1,32 @@
+#pragma once
+
+#include <kernel/Device/FramebufferDevice.h>
+#include <kernel/Terminal/TerminalDriver.h>
+
+namespace Kernel
+{
+
+	class FramebufferTerminalDriver final : public TerminalDriver
+	{
+	public:
+		static FramebufferTerminalDriver* create(BAN::RefPtr<FramebufferDevice>);
+
+		virtual uint32_t width() const override { return m_framebuffer_device->width() / font().width(); }
+		virtual uint32_t height() const override { return m_framebuffer_device->height() / font().height(); }
+
+		virtual void putchar_at(uint16_t, uint32_t, uint32_t, Color, Color) override;
+		virtual void clear(Color) override;
+
+		virtual void set_cursor_position(uint32_t, uint32_t) override;
+
+	private:
+		FramebufferTerminalDriver(BAN::RefPtr<FramebufferDevice> framebuffer_device)
+			: m_framebuffer_device(framebuffer_device)
+		{ }
+
+	private:
+		BAN::RefPtr<FramebufferDevice> m_framebuffer_device;
+		static constexpr Color s_cursor_color = TerminalColor::BRIGHT_WHITE;
+	};
+
+}