Custom poll answers were previously printed into the gnuplot control
file directly, between double-quotes. As a result, if a poll answer
contains a double-quote, it could cause a syntax error in the gnuplot
script, or worse.

Gnuplot accepts standard C-style double-quoted string escapes, so I can
just use ruby's "inspect" method to generate a safetly escaped string.

Note that within the string, % still has to be escaped separately
(doubled) to avoid issues with the string formatting. As well, I have
disabled "enhanced" mode which allows using special characters for
formatting commands.

Fixes #3039

recording: Restore the $meeting_start/end global variables

These were commented out, apparently by accident, when the metadata code
was being refactored. The effect was that the $meeting_end variable was
treated as if it had a value of zero, meaning that the last slide had a
start time of some positive number and an end time of zero. As a result,
it was never shown (and didn't get any shapes either).

Fixes #3021

Remove old php library 

HTML5: Small corrections to userUpdateVoice and emoji refactoring

This is supossed to be called when handling messages from the redis queue
and when called here would cause errors because it had no callback function.

The correct way is not calling it here, but handling the muting/unmiting when
receiving messages (which is already done).

Fixed on bug in matching for http/https

Updates to bbb-conf to support HTTPS configuration

Update API demos to work with https

Added missing div to fix WebRTC audio for JavaScript API demo

Fix missing get_flash_player.gif error message in nginx logs

fix for #3012 no presenter after ex-presenter kicked

The new directory [deleted] is now included when deleting recordings with bbb-record

Fix bigbluebutton/bigbluebutton#2710

Fix for bugs related to new states for recordings

bigbluebutton-web: Prevented apiController to crash if in a getRecordings request the metadata.xml fiel doesn't exist

Fix for bug in scripts for processing recordings

Show chat options tab when private chat disabled

Cleaned up undefined emoji strings

Four minor accessibility fixes

bigbluebutton-web: On changeState, create the directory named by the pathname, including any necessary but nonexistent parent directories.