Mecha

Fix
* No scientific notation when serializing numbers ([`e923224`](https://github.com/mcbeet/mecha/commit/e923224acc1c308e59dbdc44e2822f4db912a075))

Fix
* Make it possible to spread nbt paths on multiple lines ([`8c66564`](https://github.com/mcbeet/mecha/commit/8c66564a6190aaf40c84b0cfce438ce128bc76d4))

Feature
* Support item and attribute assignment ([`459a2da`](https://github.com/mcbeet/mecha/commit/459a2da008e5886dcf1a82d61b21e31a381ae7bc))
* Support list and dict unpacking ([`a0267a4`](https://github.com/mcbeet/mecha/commit/a0267a47e3088ed23b93d964f0f51a46fd980ec5))
* Support keywords and unpacking for function calls ([`fbd5c9b`](https://github.com/mcbeet/mecha/commit/fbd5c9b40075513355a99869339a750d0b83c69f))
* Interpolate coordinates ([`6f8f009`](https://github.com/mcbeet/mecha/commit/6f8f009e5f6dfa92fb99a326090391b533290cde))

Feature
* Remove providers, add global ctx again, and tweak generate_tree ([`e03969e`](https://github.com/mcbeet/mecha/commit/e03969efe4d177f7e2ae2b67e4e78f047478ef01))

Feature
* Add scripting sandbox ([`ae343d2`](https://github.com/mcbeet/mecha/commit/ae343d262525880dd63ff4305183d201646cc88a))
* Expose generate utilities ([`9ef34c6`](https://github.com/mcbeet/mecha/commit/9ef34c6e53f01ba6e1d58bfcdc2d54eea3a12d85))

Fix
* Store builtin names on the runtime ([`bc747e0`](https://github.com/mcbeet/mecha/commit/bc747e0cf17d20897c5fb6769750185b5024f6e1))

Fix
* Off-by-one line mapping ([`7fcd2da`](https://github.com/mcbeet/mecha/commit/7fcd2dab6b602fd000f7efc5a28a63089145c00c))
* Import regular python modules through helper ([`6ff1de3`](https://github.com/mcbeet/mecha/commit/6ff1de302c09dba220ae450c7904d8a8f4a5a1ce))