Fix ConcurrentModificationException.

[bgrozev]

• Fix/supress warnings.
• fix: Set XML parsing settings.
• ref: Reuse ParticipantInfo.toEndpoint.
• fix: Fix ConcurrentModificationException when bridge count changes.

[codecov]

Codecov Report

Merging #984 (45d3ee7) into master (21c4a3c) will increase coverage by 0.35%.
The diff coverage is 60.86%.

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #984      +/-   ##
============================================
+ Coverage     31.19%   31.54%   +0.35%     
- Complexity      523      533      +10     
============================================
  Files           116      116              
  Lines          7010     7008       -2     
  Branches        960      955       -5     
============================================
+ Hits           2187     2211      +24     
+ Misses         4558     4537      -21     
+ Partials        265      260       -5     

Impacted Files	Coverage Δ
...otlin/org/jitsi/jicofo/conference/source/Source.kt	0.00% <0.00%> (ø)
...org/jitsi/jicofo/bridge/colibri/Colibri2Session.kt	0.00% <0.00%> (ø)
...tlin/org/jitsi/jicofo/bridge/colibri/Extensions.kt	0.00% <0.00%> (ø)
...ofo/src/main/java/org/jitsi/jicofo/rest/Debug.java	0.00% <ø> (ø)
...main/kotlin/org/jitsi/jicofo/xmpp/MuteIqHandler.kt	19.27% <0.00%> (ø)
...tsi/jicofo/conference/JitsiMeetConferenceImpl.java	48.20% <88.88%> (+0.93%)	⬆️
...ofo/src/main/kotlin/org/jitsi/jicofo/xmpp/Smack.kt	100.00% <100.00%> (ø)
...o/src/main/kotlin/org/jitsi/jicofo/FocusManager.kt	61.53% <0.00%> (+0.96%)	⬆️
.../java/org/jitsi/jicofo/conference/Participant.java	74.83% <0.00%> (+2.58%)	⬆️
... and 1 more

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