Compare current syntax highlight with TextMate grammars

[macor161]

VSCode uses TextMate grammar for its syntax highlighting.

Benefits:

• Implementation already available
• Less maintenance when Solidity language changes occur

Drawbacks:

• Slower
• Doesn't handle partial code, as it is required in errors and warnings.
• Maybe difficult to integrate line/column indicator for warnings and errors

We should :

• Determine how much slower the TextMate implementation is.
• Examine the possibility of removing partial code requirements. i.e. Syntax highlight the whole file before extracting the snippet of lines of context for the error/warning. Measure the impact on speed of this approach.
• Estimate the effort necessary for adding line/column indicators.
• Estimate total effort of migrating to TextMate syntax highlighting

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Solidity syntax highlight example currently used in VSCode solidity extension: https://github.com/juanfranblanco/vscode-solidity/blob/master/syntaxes/solidity.json