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This adds a portable, scanline-based polygon filling algorithm, which fills a polygon by drawing a collection of adjacent horizontal lines. This change is motivated by the Rockbox port's current lack of a true polygon fill capability. Until now, it attempted to approximate a polygon fill by performing a series of triangle fills, but this worked reliably only for convex polygons. I originally considered making this new rasterizer part of the Rockbox front end itself, but I ultimately decided that it made more sense to include it here, in the Puzzles distribution, where other platforms may benefit from it in the future. No in-tree front ends use this new function quite yet, but I plan to follow this commit with a compile-time option to force front ends to use it for testing. This new polygon drawing code also comes with its own standalone driver code to test it out in isolation. This code currently relies on SDL 2.0 to present a GUI window to the user, which unfortunately adds a build-time dependency. To lessen the impact of this change, this program is gated behind a CMake build option. To use it, run: $ cmake -DBUILD_SDL_PROGRAMS=true