[BISERVER-12037] - HttpMimeTypeListener is in two packages (same code)

Talked with Will G. and deprecated the class that was created second (went back to svn to verify).
BACKLOG-611 - CLONE - The scheduler with name, containing special symbols cannot be edited
Merge pull request #1924 from jeffreythomas/dev

[BISERVER-12037] - HttpMimeTypeListener is in two packages (same code)
Merge pull request #1905 from Aliaksandr-Kastenka/BACKLOG-611

BACKLOG-611 - CLONE - The scheduler with name, containing special symbol...
[CLEANUP] Checkstyles in the extensions project