Harmonize Title-Parsing of Movies and TV-Series

[rcrdnalor]

MythTV parses filenames of movies and series according
the scheme defined in
https://www.mythtv.org/wiki/MythVideo_File_Parsing

For tv-series, it is allowed to add the year in the title,
like The Forsyte Saga (1967) or The Forsyte Saga (2002),
e.g.: The Forsyte Saga (1967) 1x01 A Family Festival.mkv
is correctly parsed.
This may help the television grabber of MythTV to find the
correct entry.

In contrast, all kind of braces are removed from the filename
when parsing video titles:
Ocean's Eleven (2001).mp4 becomes Ocean's Eleven 2001
according the filename convention on the wiki.
This confuses the movie grabber of MythTV because it
cannot be distinguished whether the year is part of the
title or it is the year of the release. For exact this reason,
grabbing for titles ending with a year is not implemented in
the movie grabber tmdb3.py.
Popular examples for different movies with year in the title:
Wonder Woman vs. Wonder Woman 1984
Blues Brothers vs. Blues Brothers 2000

This change respects parentheses "()" in the filename of
a movie, thus parsing of the release year will work.
Furhermore, it enables correct parsing of titles containing
parentheses, like I (Almost) Got away with It or
(T)Raumschiff Surprise - Periode 1.
Advanced searches on imdb.com for 'parenthesis in title'
and 'movies with year in the title' show a lot of matches,
but I found no movie title that ends with a year (4 digits)
in parentheses.

The wiki page at https://www.mythtv.org/wiki/MythVideo_File_Parsing
needs to be upated that the correct syntax is from now on
"A Movie Title (YYYY).mpg" instead of "A Movie Title YYYY.mpg".
The latter was introduced in 2012 without providing a rationale,
but afaik never implemented by the MyhTV movie grabbers
(ttmdb3.py, tmdb.py or its predecessor jamu.py).
Backward compatibility is provided, i.e.: adding a releaase year
without parentheses works the same way as before this change:
The movie grabber will probably not find the correct entry.

This pull reqest supersedes PR #103 .

Checklist

• [x ] contribution does not duplicate one of our existing pull requests
• [x ] contribution is in a branch rebased against master
• [x ] code compiles successfully without errors
• [x ] code follows the MythTV Coding Standards
• [x ] documentation added/updated/removed where necessary
• [x ] commits are logically organised and have good commit messages

[rcrdnalor]

@jpoet : Could you please review this PR? I know from the past conversations on the mailing list, that you are interested in this feature.
Thx, Roland