Mecha

Fix
* Small optimization and update tokenstream to get sorted explanations ([`510da71`](https://github.com/mcbeet/mecha/commit/510da716aec9b393733bcb13e186e2c93da23317))

Fix
* Make line mapping more compact ([`4044ce4`](https://github.com/mcbeet/mecha/commit/4044ce4355946f334c14e7b891aa4faf3a77bea1))

Feature
* Add import statements ([`970bd01`](https://github.com/mcbeet/mecha/commit/970bd017d8104ea2c54ebc85c2d2c58ffe735e9f))
* Inject context object ([`98e6727`](https://github.com/mcbeet/mecha/commit/98e672712819d37f34856a1fa5701157dc0cfbbe))
* Expose ctx ([`e1714f0`](https://github.com/mcbeet/mecha/commit/e1714f0bdb1fc473e3fecfe28818294bf4692501))
* Add yield statements ([`410e60a`](https://github.com/mcbeet/mecha/commit/410e60a35266ed5e66ca52a3c4aaa30064d26627))
* Add globals ([`7d934a2`](https://github.com/mcbeet/mecha/commit/7d934a20f82cad8b97f8126a03cee0a5e086227e))
* Tweak constraints and make it possible to convert tuples to ranges ([`f130359`](https://github.com/mcbeet/mecha/commit/f130359b5b3768b7dc9d59a46a24d9e808a30497))
* Add f-strings ([`88b12d2`](https://github.com/mcbeet/mecha/commit/88b12d2cf64296d8cb228d3817d9db8d93f727e2))
* Add tuples ([`80534e5`](https://github.com/mcbeet/mecha/commit/80534e5af70d2459aef4215b46912ecf5316e716))

Feature
* Track line numbers and rewrite tracebacks coming from generated code ([`8582212`](https://github.com/mcbeet/mecha/commit/8582212361aed3fa0c6f6dc575cf9d18725478d1))

Fix
* Add exception handling to dispatcher ([`d8e9e95`](https://github.com/mcbeet/mecha/commit/d8e9e9563a6d4576efa815e0e4fb3d8f96eea04e))
* Typo when tracking attribute source location ([`500441d`](https://github.com/mcbeet/mecha/commit/500441d959ba670ef70936a659089160e7584090))

Feature
* Interpolation now works on most nodes instead of command arguments specifically ([`288f836`](https://github.com/mcbeet/mecha/commit/288f836fff0c447bb743d89b46b1dfc06d53b7f8))
* Add codegen ([`0d4409f`](https://github.com/mcbeet/mecha/commit/0d4409ffa271f8968f16a84a4be20063e920c0de))

Fix
* Invalidate ast cache on version bumps ([`0cd634c`](https://github.com/mcbeet/mecha/commit/0cd634c5deffe0bbbe1efa4f1498364b28a6f266))
* Forgot to take into account number of matched fields when sorting rules ([`d13fa3c`](https://github.com/mcbeet/mecha/commit/d13fa3c06a42d6cfe28b8e775ba3af4e77093cff))
* Convert normalizers to parsers and get rid of normalize step ([`2c44606`](https://github.com/mcbeet/mecha/commit/2c44606e146d1d27a6061cf056fb931a08a51147))

Feature
* Parse lists and dicts ([`5b1776b`](https://github.com/mcbeet/mecha/commit/5b1776be44c63392060e56f47a03082dcf201871))