Some details

Some minor fixes:
- WEAP_INSTAGUN was missing from the HUD scripting API, making it impossible to set custom icons for it (unless you code the actual value into the script).
- Some vote messages had a double space if the vote did not have arguments. I'm probably the only one who notices this, but it annoys me every time. :p
- The processing of the map rotation did not consider the current map, so if you started playing on wdm1 and wdm1 was also the first map in the rotation, the first match advance would be to wdm1 again. This change makes sure the index is initialized to that of the current map (if possible), which also means that the rotation will just continue if you add a map while being in the middle of it.