Fixed|Bindings|Multiplayer: Crash when more than one client in the game

When checking for player controls, a null pointer was accessed
in P_IsControlBound().
Fixed|libcommon: Don’t check control input of remote players

Remote players are moved according to a smoothed path of received
coordinates, not any control input values.
libcommon|UI: Make sure game is frozen before opening a network connection
Fixed|Shell|libshell: ServerFinder must work without a de::App
Fixed|Shell|OS X: Use the correct UI font (Lucida Grande)

IssueID #1703