[Feature] Syntax highlighting for TOML files

[fgimian]

Hey there, amazing job on this application!

I noticed that TOML files (which are quite prominent in Rust and Python projects) don't have syntax highlighting. Any chance of adding support for them please?

Thanks
Fotis

[gadfly3173]

I think this need to add configuration from https://github.com/textmate/toml.tmbundle/blob/master/Syntaxes/TOML.tmLanguage into https://github.com/danipen/TextMateSharp .

[aikawayataro]

There also is https://github.com/tamasfe/taplo/blob/master/editors/vscode/toml.tmLanguage.json that is fresher and in a supported JSON format

[love-linger]

Here's how to add unsupported syntax highlighting in this program.

• create your TextMateSharp compatible language grammar under the src/Resources/Grammars/ directory
• modify src/Models/TextMateHelper.cs file, find the constructor of RegistryOptionsWrapper, then add the filename of your grammar to the extraGrammarFiles array.

public RegistryOptionsWrapper(ThemeName defaultTheme)
{
    _backend = new RegistryOptions(defaultTheme);
    _extraGrammars = new Dictionary<string, IRawGrammar>();

    string[] extraGrammarFiles = ["toml.json"]; // Add the filename of your grammar here
    foreach (var file in extraGrammarFiles)
    {