add attr5..7, add mapmodel pitch and roll

Keys 5, 6 and 7 (in combination with the scrollwheel) can be used to alter
the new entity attributes.

Pressing editmeta (LCTRL by default) speeds up the scrolling.

(Parts of the roll code are borrowed from Alejandro V. Garcia's commit
"Model rotations, experimental" from January 2013)

Note: coop edit is now broken between "next" and older clients, but I
  don't want to bump the protocol just yet.

source/src/protocol.cpp

@@ -329,7 +329,7 @@ static const int msgsizes[] =               // size inclusive message token, 0 f
     SV_SHOOT, 0, SV_EXPLODE, 0, SV_SUICIDE, 1, SV_AKIMBO, 2, SV_RELOAD, 3, SV_AUTHT, 0, SV_AUTHREQ, 0, SV_AUTHTRY, 0, SV_AUTHANS, 0, SV_AUTHCHAL, 0,
     SV_GIBDIED, 5, SV_DIED, 5, SV_GIBDAMAGE, 7, SV_DAMAGE, 7, SV_HITPUSH, 6, SV_SHOTFX, 6, SV_THROWNADE, 8,
     SV_TRYSPAWN, 1, SV_SPAWNSTATE, 23, SV_SPAWN, 3, SV_SPAWNDENY, 2, SV_FORCEDEATH, 2, SV_RESUME, 0,
-    SV_DISCSCORES, 0, SV_TIMEUP, 3, SV_EDITENT, 10, SV_ITEMACC, 2,
+    SV_DISCSCORES, 0, SV_TIMEUP, 3, SV_EDITENT, 13, SV_ITEMACC, 2,
     SV_MAPCHANGE, 0, SV_ITEMSPAWN, 2, SV_ITEMPICKUP, 2,
     SV_PING, 2, SV_PONG, 2, SV_CLIENTPING, 2, SV_GAMEMODE, 2,
     SV_EDITMODE, 2, SV_EDITH, 7, SV_EDITT, 7, SV_EDITS, 6, SV_EDITD, 6, SV_EDITE, 6, SV_NEWMAP, 2,