Mecha

Feature
* Add mecha.contrib.nesting ([`94594da`](https://github.com/mcbeet/mecha/commit/94594da2f5602ff6048768464137c8da89e00e27))
* Add cli command for dumping mecha ast ([`f0cb044`](https://github.com/mcbeet/mecha/commit/f0cb044a40594225aea49a566387b6f0d67b8391))

Fix
* Keep track of the current step in the database ([`c5a7737`](https://github.com/mcbeet/mecha/commit/c5a77374d4439e362cd480a1fe29e3bfb18f8ef3))
* Make it possible to create resource location nodes from strings ([`6644606`](https://github.com/mcbeet/mecha/commit/6644606269e4b4674e363bbb3bc3c108c6642fbf))

Fix
* Handle possible conflicts between execute shorthands and commands ([`c10f8cb`](https://github.com/mcbeet/mecha/commit/c10f8cbed99a7a4357d3d7f7b184d19e366a89eb))

Feature
* Add keep_comments option ([`efda05a`](https://github.com/mcbeet/mecha/commit/efda05a72e361429cad309fedce477580212bb90))

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))