Release 0.4.0

• All new meson build system
• Experimental MacOS and Windows build support
• Use emu2149 to generate sound (removes dependency on SDL_mixer)
• Dynamically load OpenGL ES 2/3 functions using SDL (removes compile-time dependency on GLESv2)
• Add hqish renderer

Release 0.3.0

Some improvements since last release:

• hq4x renderer (launch with --renderer hq4x) (#19)
• Sounds re-generated to match original ST version better
• Usability improvements

Release 0.2.0

The game should now be feature-complete (though probably not bug-free), so it was about time to roll a new release.