* Add: xtask to check themes for validation warnings
* Update: tidied up runtime paths
* Update: test build workflow
* Update: address clippy lints
* Revert: only trigger workflow on push to master branch
* Add: Theme::from_keys factory method to construct theme from Toml keys
* Update: returning validation failures in Loader.load method
* Update: commented out invalid keys from affected themes
* Update: correct invalid keys so that valid styles still applied
* Update: include default and base16_default themes in check
* Update: renamed validation_failures to load_errors
* Update: introduce load_with_warnings helper function and centralise logging of theme warnings
* Update: use consistent naming throughout
Add new theme highlight keys, for setting the colour of the breakpoint
character and the current line at which execution has been paused at.
The two new keys are `ui.highlight.frameline` and `ui.debug.breakpoint`.
Highlight according to those keys, both the line at which debugging
is paused at and the breakpoint indicator.
Add an indicator for the current line at which execution is paused
at, themed by the `ui.debug.active` theme scope. Update various themes
to showcase how the new functionality works.
Better icons are dependent on #2869, and as such will be handled in the
future, once it lands.
Closes: #5952
Signed-off-by: Filip Dutescu <filip.dutescu@gmail.com>
the bottom value is used, so i've removed the top `ui.help` values from all themes
also, the values are not merged, so:
```toml
"ui.help" = { modifiers = ["reversed"] }
"ui.help" = { fg = "white", bg = "black" }
```
is equal to:
```toml
"ui.help" = { fg = "white", bg = "black" }
```
