Fix * Resolve source paths provided for validation according to the context directory ([`72e638f`](https://github.com/mcbeet/mecha/commit/72e638fe75392b70d06661c67c6405b1ac99281c)) * Add missing template_rotation and template_mirror parsers ([`718c907`](https://github.com/mcbeet/mecha/commit/718c907e263e3b516fe1881fd3f4775485d3d1e9))