Motivation for changes:

magnetdl search returns error 404 every time the search term contains a special character because magnetdl.com search path can only contains [a-z0-9] and slashes/-. Current implementation is not good enough.

Detailed changes:

• Unicode characters are normalized to ASCII first before all invalid chars are stripped to construct a valid search URL
• For example, search term "Pépé le Moko (1937)" should now be constructed as https://www.magnetdl.com/p/pepe-le-moko-1937

Log and/or tests output (preferably both):

Magnetdl.com should return 200 even when there is no matches but it returns error 404 due to malform URLs

2022-12-27 12:44:24 WARNING  magnetdl      download-movie-queue Url https://www.magnetdl.com/s/sample-movie-(2001)/ returned 404
2022-12-27 12:44:23 WARNING  magnetdl      download-movie-queue Url https://www.magnetdl.com/p/p<C3><A9>p<C3><A9>-le-moko-(1937)/ returned 404
2022-12-27 12:44:20 WARNING  magnetdl      download-movie-queue Url https://www.magnetdl.com/y/you-&-i/ returned 404