This commit adds a new ShapeBuffer type, which contains some buffers tha
are commonly re-created during the shaping process. New APIs are added
that take this structure, and old APIs are turned into wrappers around
the new API.
The goal is to reduce the number of per-layout allocations that happen
in a typical layout call.
* WIP VI wrapper for editor
* WIP: block cursor
* Create Edit trait, run CI on all feature options
* Add prints describing build steps to ci.sh
* Custom rendering for Vi editor
* Clippy fixes
* More clippy fixes
* Show clippy results in CI
* Fix for Redox
* Fix clippy lint
* Add vi feature to enable vi-style editor
* Add escape to libcosmic text box
