Make the allowed SSL Ciphers a protocol option for CurlFile.

Recent versions of libcurl disable the RC4-SHA cipher that is still used by some sites.
While certainly the right decision, it breaks (at least) the YouTube addon.

This patch allows addons to explicitly request disabled ciphers via a protocol option:
https://host/path|SSLCipherList=DEFAULT:RC4-SHA
paplayer: rewind stream after init (ffmpeg codec)
AESinkPULSE: Revisit volume
AE: User per cent volume by default
ActiveAE: verify resample context before using it
Merge pull request #4504 from FernetMenta/paplayer

paplayer: rewind stream after init (ffmpeg codec)
Merge pull request #4502 from fritsch/pa-revisit-volume2

AESink: Revisit volume part 2
Merge pull request #4510 from FernetMenta/aefixes

ActiveAE: verify resample context before using it
Merge pull request #4489 from Orochimarufan/sslcipher

Make the allowed SSL Ciphers a protocol option for CurlFile.
Don't expose invisible settings to JSONRPC