Partially load the config even when there is an error

[antoyo]

Hi.

Describe your feature request

It would be nice if the config could ignore the errors and continue loading the settings that work.
For instance, if I write heme instead of theme, helix will show the following error:

Bad config: unknown field `heme`, expected one of `theme`, `lsp`, `keys`, `editor` at line 1 column 1
Press <ENTER> to continue with default config

but it won't continue loading the other settings, which is inconvenient because you lose your key bindings for instance.

[pascalkuthe]

I am closing this according to the discussion in #1814.

The TOML config is a stopgap solution that should be kept simple. It will be superseded by a script-based config in the future where partial evaluation is not practical anyway.