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. :^)

SharedGraphics/Color.cpp

@@ -1,81 +0,0 @@
-#include "Color.h"
-#include <AK/Assertions.h>
-
-Color::Color(NamedColor named)
-{
-    struct {
-        u8 r;
-        u8 g;
-        u8 b;
-    } rgb;
-
-    switch (named) {
-    case Black:
-        rgb = { 0, 0, 0 };
-        break;
-    case White:
-        rgb = { 255, 255, 255 };
-        break;
-    case Red:
-        rgb = { 255, 0, 0 };
-        break;
-    case Green:
-        rgb = { 0, 255, 0 };
-        break;
-    case Cyan:
-        rgb = { 0, 255, 255 };
-        break;
-    case Blue:
-        rgb = { 0, 0, 255 };
-        break;
-    case Yellow:
-        rgb = { 255, 255, 0 };
-        break;
-    case Magenta:
-        rgb = { 255, 0, 255 };
-        break;
-    case DarkGray:
-        rgb = { 64, 64, 64 };
-        break;
-    case MidGray:
-        rgb = { 127, 127, 127 };
-        break;
-    case LightGray:
-        rgb = { 192, 192, 192 };
-        break;
-    case MidGreen:
-        rgb = { 0, 192, 0 };
-        break;
-    case MidBlue:
-        rgb = { 0, 0, 192 };
-        break;
-    case MidRed:
-        rgb = { 192, 0, 0 };
-        break;
-    case MidMagenta:
-        rgb = { 192, 0, 192 };
-        break;
-    case DarkGreen:
-        rgb = { 0, 128, 0 };
-        break;
-    case DarkBlue:
-        rgb = { 0, 0, 128 };
-        break;
-    case DarkRed:
-        rgb = { 128, 0, 0 };
-        break;
-    case WarmGray:
-        rgb = { 212, 208, 200 };
-        break;
-    default:
-        ASSERT_NOT_REACHED();
-        break;
-    }
-
-    m_value = 0xff000000 | (rgb.r << 16) | (rgb.g << 8) | rgb.b;
-}
-
-String Color::to_string() const
-{
-    return String::format("#%b%b%b%b", red(), green(), blue(), alpha());
-}