output: alternative formats

We already have colored/non-colored output, but it might be useful to include multiple formats.

Examples:

oneline: Short, concise, like grep does with recursive searching. Intended for human consumption. Optionally colored. Hides complete squad, only shows actually matching person.

/path/to/log: Boss - AccountName.1234 CharacterName (Profession)

json: JSON serialized output, records separated by newline. Intended for further processing, if raidgrep is used by other programs (e.g. a GUI frontend)

{"path": "...", "boss": "...", "squad": [{"account": ..., "character": ..., ...}, ...]}