fix: trim comment tokens

chore: add Debug to custom types

fix: make all matching colors lowercase

chore: fix formatting using fmt

feat: split logic of context and comment tokens

Respect DRY for file_parser. So far, the file parser did not
just parse the file, it also parsed custom comment "tokens"
and managed a context. This is not the responsibility of the
parser. The parser should just parse the file and return
the parsed parts.