* Move `runtime/themes/base16_default_terminal.toml` to
`base16_theme.toml` alongside `theme.toml`
* Use `terminfo` crate to detect whether the terminal supports true
color and, if the user has no theme configured and their terminal does
not support true color, load the alt default theme instead of the
normal default.
Remove `terminfo` dependency, use `COLORTERM` env instead
Prevent user from switching to an unsupported theme
Add `true-color-override` option
If the terminal is wrongly detected to not support true color,
`true-color-override = true` will override the detection.
Rename `true-color-override` to `true-color`
This is necessary to workaround ownership issues across function calls.
The issue notably arised when implementing the registers into `Editor`
and I was getting annoyed again when implementing copy/pasting into
system clipboard.
The problem is addressed by using macro calls instead of function calls.
There is no notable side effect.
* Add convenience/clarity wrapper for Range initialization
* Add keycode parse and display methods
* Add remapping functions and tests
* Implement key remapping
* Add remapping book entry
* Use raw string literal for toml
* Add command constants
* Make command functions private
* Map directly to commands
* Match key parsing/displaying to Kakoune
* Formatting pass
* Update documentation
* Formatting
* Fix example in the book
* Refactor into single config file
* Formatting
* Refactor configuration and add keymap newtype wrappers
* Address first batch of PR comments
* Replace FromStr with custom deserialize
