[release] Prepare for next development iteration

Change-Id: Ibf45f86b5f7b3972b6453ca25ccc053a500db76f
Move common files used by several tests to common folders

Change-Id: I2bc6b930a726ef0f90fdb820322c94d69e4c33d1
selectable.js: Allow dynamic configuration of endpoints

Change-Id: Id7661c41f2d5d0693ba582cc2a60570dcc215877
SelectableRoomHandler: Generate id out of the participant class

Change-Id: Ic0d62b66fa44bdfd5b1f3a1c074841d517203c87
Add dispatcher N to N test

Change-Id: Ibef3fd38b65750de2e4e0860a84e1f96f4dc729c
Fixed bugs in Dispatcher demo

Change-Id: I760a855b39cc26b055e94534b9609270221ff5ed
Simplification of Selectable and Dispatcher demos

Change-Id: Ic230e7c09ed540105586bb9d55fcd1e3d355f1fe
Add demo for Crowd Detector Filter

Change-Id: Ibbddb6f08a4e8184cf785aa96a39e93e8647cbe6
[release] Prepare release 4.2.0

Change-Id: I260a570058f08b4d03a361b9213775cf84f9511f