Vi-style editor and other editor improvements (#40)

* 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

src/font/fallback/other.rs

@@ -13,6 +13,6 @@ pub fn forbidden_fallback() -> &'static [&'static str] {
 }
 
 // Fallbacks to use per script
-pub fn script_fallback(script: &Script, locale: &str) -> &'static [&'static str] {
+pub fn script_fallback(_script: Script, _locale: &str) -> &'static [&'static str] {
     &[]
 }