LibDraw: Introduce (formerly known as SharedGraphics.)

Instead of LibGUI and WindowServer building their own copies of the drawing
and graphics code, let's it in a separate LibDraw library.

This avoids building the code twice, and will encourage better separation
of concerns. :^)

Libraries/LibDraw/CharacterBitmap.h

@@ -0,0 +1,24 @@
+#pragma once
+
+#include "Size.h"
+#include <AK/RefPtr.h>
+#include <AK/RefCounted.h>
+
+class CharacterBitmap : public RefCounted<CharacterBitmap> {
+public:
+    static NonnullRefPtr<CharacterBitmap> create_from_ascii(const char* asciiData, unsigned width, unsigned height);
+    ~CharacterBitmap();
+
+    bool bit_at(unsigned x, unsigned y) const { return m_bits[y * width() + x] == '#'; }
+    const char* bits() const { return m_bits; }
+
+    Size size() const { return m_size; }
+    unsigned width() const { return m_size.width(); }
+    unsigned height() const { return m_size.height(); }
+
+private:
+    CharacterBitmap(const char* b, unsigned w, unsigned h);
+
+    const char* m_bits { nullptr };
+    Size m_size;
+};