Mecha

Fix
* Refactor multiline argument handling and make block and item parsers more modular ([`0badf8c`](https://github.com/mcbeet/mecha/commit/0badf8ccc75176c19128dc4922e80347fc0924c6))

Fix
* Quick fix for messages spanning over multiple lines accidentally ([`d065c8b`](https://github.com/mcbeet/mecha/commit/d065c8b42bf6ac22ae76735d3095eff7ec76b6a9))

Fix
* Remove error message and automatically activate multiline when using nesting ([`8594bf0`](https://github.com/mcbeet/mecha/commit/8594bf02a306a6622c25d3fd584c299b0d08fe17))

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))