Warn players in room when admin lefts room

- Frontend: reorganize code controlling widgets state, fix problems getting room admin status - Server: rename room after new room master

Fix frontend ROOM_CONTROL_ACCESS protocol command handler

Send leaving message and remove room admin's teams when he exits

Update Polish translation

Implement room delegation (not tested, only one predefined name to rename room)

Fix a bug when you are unable to do anything in lobby when room is closed during round

Prevent "free knocking" bug

An experiment with increasing number of caves by selecting a few potential non-cave maps and adding to the cave map array. Ones selected here might not actually be that playable as caves.

Some preparation for room control delegation support

fix windows compilation with dll (frontend and engine)

Change password dialog to be more informative

Ask user for a nickname on first run, suggest login name

Add respawning mines mode as a hack. To test uncomment lines 1456-1460 in uGears.pas

Lower bound on speech text width for proper rendering

Another try at keeping blowtorch/firepunch/jackhammer from going through indestructible stuff. Shame these routines don't use hedgehog movement

correct typo found by Smaxx

Fix bug with hedgehog getting into ground while throwing rope (http://hedgewars.org/node/1722)

improved fix for right click on mac

restored volumen control (hoorray)

rename dpr -> pas, restores ammos on two columns, minor fixes to openalbridge

Optimize many sprites

Add Battlefield map

Rename octopus grave