botguard interface fixes:
- stock site was updated to ignore entries in the pending data queue after a time
- correctly process the 'c' response from the server - it's an array, not a single item (oops!)
COMM code: add method to request access to a COMM channel even when not viewed by the player
player tracker plugin: update to use new method to register interest in background COMM when needed
fix #885
[core] passcode contents are displayed correctly

Includes some other small fixes regarding passcodes.

Fixes #883
remove old code from obsolete nickname resolving
website: update for new 0.18.1 release
bump version number after new release
draw-tools plugin: new feature - snap points to portals
useful to fix badly placed lines/polygons
Merge pull request #3 from jonatkins/master

update