Standalone parser with to json and back converters

[knopki]

• Setup project
• Standalone lark parser
• Rudimentary topas-to-json and json-to-topas converters with CLI tools
• Tests

[blokhin]

this project seems to be down 😞

[blokhin]

@knopki wow, this is so C++ 😆

[blokhin]

@knopki why a standalone version is used, rather than an installable library?

[blokhin]

w.r.t.

Regenerate standalone lark parser after grammar.lark change: make parser

[knopki]

@knopki why a standalone version is used, rather than an installable library?

Compiling a grammar is about 5 seconds. If you use lark as a library, you'll either have to make the user suffer (compile to cache on the first run) or ship the cache with the package. When using the standalone version, almost the entire file is the result of compiling the grammar.
And the lack of runtime dependencies is more of a positive feature.