2.0.0.dev22

python3 -m pip install pygame==2.0.0.dev22

Several very difficult to find and fix issues with alpha blending were fixed in this release.

• First pass at backwards compatible pygame alpha blit by @MyreMylar

The new alpha blitter has an SSE2 and arm NEON implementation, and keeps compatibility with pygame 1.

Also some progress on other issues, including these...

• Fix twitchy key tests on raspi by @ankith26
• Better unit tests for event module by @ankith26
• Fix messed up SSE 4.2 removal