Beet

Fix
* Put message retrieval logic into MessageManager ([`0f187f2`](https://github.com/mcbeet/beet/commit/0f187f23d0a76d1f0b73697c706cf36d7453c5a4))

Fix
* Cleanup empty containers and namespaces after merge ([`43b7d08`](https://github.com/mcbeet/beet/commit/43b7d086b5347c80a189ec6f9234cb73f50625ab))

Fix
* Missing return type for resolve_scope_map() ([`1968f50`](https://github.com/mcbeet/beet/commit/1968f504a14c2332421583973dfeb71305ece401))

Feature
* Add beet.contrib.messages ([`d623640`](https://github.com/mcbeet/beet/commit/d623640ee5e711a9aecefa44889301f30db36f30))

Fix
* Add snake_case utility ([`8009226`](https://github.com/mcbeet/beet/commit/8009226dc9437b57529c2efcc14696fe1c34c145))
* Rename GlyphSizes and true_type_fonts ([`718b36b`](https://github.com/mcbeet/beet/commit/718b36b152faa68bfa46ab4debb83e47e13c7bc3))

Fix
* Tweak draft again ([`dfc3524`](https://github.com/mcbeet/beet/commit/dfc35247c08bb6fe52b4c3c480e9fcb937892c43))

Fix
* Tweak log_time, draft API, cache formatting, and add Pack.configure ([`2dca46d`](https://github.com/mcbeet/beet/commit/2dca46d759ea7b315a5dfa81ad7100d426ff56fa))