Bolt

Feature
* Add memo and a bunch of tweaks ([`77326b7`](https://github.com/mcbeet/bolt/commit/77326b7056a038743a1f20511ae565cacbc15f10))

Feature
* Refactor identifier tracing with proper lexical scope abstraction ([`2f60bd4`](https://github.com/mcbeet/bolt/commit/2f60bd43c8affc2747c56e2d4dd4045e45561677))

Fix
* Default empty arguments for AstFunctionSignature ([`6c79443`](https://github.com/mcbeet/bolt/commit/6c794431fe5b4c826dea8cae54a63d8c54838ad9))

Feature
* Add bolt.contrib.defer ([`6a0527f`](https://github.com/mcbeet/bolt/commit/6a0527f4696081a168a5adbfbb6a5f74d4853c4b))
* Add CommandCollector ([`a07cedd`](https://github.com/mcbeet/bolt/commit/a07cedd2e4636b50494ff7cdd914050d194fe922))
* Disable mecha.contrib.inline_function_tag by default ([`a9bf8bf`](https://github.com/mcbeet/bolt/commit/a9bf8bfe3d7bb39d767c204e4f06a80cc4133d78))

Fix
* Reset token generator after discarding builtin identifier in interpolation ([`37f74bc`](https://github.com/mcbeet/bolt/commit/37f74bc8f9fbf60b0493bf8e158be678ced5f272))

Feature
* Interpolate advancement predicate ([`e4338b0`](https://github.com/mcbeet/bolt/commit/e4338b0f4004601daf9c86b169a3771f876cff16))

Fix
* Refactor interpolation ([`44c2d0e`](https://github.com/mcbeet/bolt/commit/44c2d0ed74c8100698fa75931df626c96329b820))