v0.5.2.dev0

What's Changed

• Docstrings: Google sections and cross-references; licence headers on every file by @bdbarnett in #74
• Style check: fail a pull request on the mechanical style rules by @bdbarnett in #75
• make_faces: write the same licence header the generated files carry by @bdbarnett in #76
• Drum kits refuse a voice count other than their number of sounds by @bdbarnett in #78
• Patch2600: the reverb knob works when it's played as a voice by @bdbarnett in #77
• Release 0.5.2.dev0: Patch2600's shared spring, and drum kits refuse a cap by @bdbarnett in #81

Full Changelog: v0.5.1...v0.5.2.dev0