py3: add new helper: get_replacements_list

[lasers]

An alternative to PRs listed below.

I copied thresholds code. Minimal test. Allow users to be more specific.

Get placeholders_list first so we can target existing placeholders rather than all placeholders.
I don't know if this PR is the optimal solution, just an alternative.

Code untested on this player.. I tested on nvidia_smi. Sorry if you ran into issues.

This is just an idea / experiment.

Please test this.

# Ought to do dict (perform on matched string placeholders)
    replacements = {
        "artist": [
            "([\(\[][^)\]]*?(bonus|demo|edit|explicit|extended|feat|mono|remaster|stereo|version)[^)\]]*?[\)\]])",
            "([\-,;/])([^\-,;/])*(bonus|demo|edit|explicit|extended|feat|mono|remaster|stereo|version).*"
        ],
    }

# Ought to do list. (perform on all string placeholders)
    replacements = [
            "([\(\[][^)\]]*?(bonus|demo|edit|explicit|extended|feat|mono|remaster|stereo|version)[^)\]]*?[\)\]])",
            "([\-,;/])([^\-,;/])*(bonus|demo|edit|explicit|extended|feat|mono|remaster|stereo|version).*"
        ]

Solves #2234 (comment).

Closes #2234.
Closes #2237.

[lasers]

Ideally, we should separate this into artist and album. Who volunteer?

"([\(\[][^)\]]*?(bonus|demo|edit|explicit|extended|feat|mono|remaster|stereo|version)[^)\]]*?[\)\]])",
"([\-,;/])([^\-,;/])*(bonus|demo|edit|explicit|extended|feat|mono|remaster|stereo|version).*",

[lasers]

Merged verison of the two regex patterns according to GPT. Untested.

replacements = [
    r"([\(\[\-,;/][^)\],;/]*?(bonus|demo|edit|explicit|extended|feat|mono|remaster|stereo|version)[^)\],;/]*?[\)\]])"
]

[lasers]

@ultrabug Review plz.

[lasers]

I didn't add this for mpris and mpd_status.

I don't need this for cmus, deadbeef, moc... This PR might be better understood with more examples... is which why I added few more music modules. I can drop them... and users could contribute them later just easily... or more likely easier to leave them in... and work on mpris, mpd_status later. Idk. Modules are untested.