Port rest of regex functions from Lua to C (#120)

Ports find, find_offsets and match from Lua directly into C for
better performance on components that use them like detectindent,
tokenizer, etc...

This change also converts the regex from a table to a userdata
pointer and properly associates the related methods using a
metatable named on `API_TYPE_REGEX`. Also fixes garbage collection
of the compiled regex in LuaJIT which doesn't calls the __gc on tables.

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