for the server button

for selected room with hostname to support the multi-server feature;
implemented saving the logged hostnames to prefs and it retrieval;
added the relevant tests

Add extra to pass in if we want the default onBackPressed behavior for the Activity and want it to finish

[FIX] Fix the screen dimming when sliding in rooms with one message

[FIX] Change menu icon color to white and the badge color

[NEW] Show user status on toolbar