Mecha

Feature
* Add mecha.contrib.implicit_execute ([`835660f`](https://github.com/mcbeet/mecha/commit/835660f92fcfa9473211c84b2ed754096afb23a8))

Fix
* Tweak styling for diagnostic annotations ([`f4e3fde`](https://github.com/mcbeet/mecha/commit/f4e3fdeeb34d3564d39698336e8d66cc321d8fd3))

Fix
* Forgot final newline in mecha.contrib.annotate_diagnostics ([`b665a94`](https://github.com/mcbeet/mecha/commit/b665a948c80cb4296721a6b7d55011106c057e9c))

Feature
* Add mecha.contrib.annotate_diagnostics ([`2084667`](https://github.com/mcbeet/mecha/commit/208466709f0b2e1fc1c7a48738152d761681fb55))
* Add readonly option and setup examples ([`bdb7b1d`](https://github.com/mcbeet/mecha/commit/bdb7b1db66907e1d5eb85a6653e02f9dfd0bdea7))

Fix
* Report diagnostics with logger.warning instead of logger.warn ([`155d01c`](https://github.com/mcbeet/mecha/commit/155d01cd5215894d16a49137d92c4da8c2482696))
* Add SingleLineConstraint ([`f649b4a`](https://github.com/mcbeet/mecha/commit/f649b4a7bc1cf74725724c22c1fb5ad7767ce03b))

Fix
* Prevent error when the location is outside the view ([`96c8005`](https://github.com/mcbeet/mecha/commit/96c800527a6b02ba14a47be74976979c9e534294))

Fix
* Database.current is now properly updated ([`e74cd13`](https://github.com/mcbeet/mecha/commit/e74cd13b013df43911a463c5a0c7a457e193f672))