Minor improvement to SignaledType

Allows using non-void functions as callbacks, as originally intended.
Fix assert caused by misuse of ScriptTeleportRequest message block data

Thanks to Nomade and Esmeralda for catching this one!
Fix SignaledType not compiling on Windows
Correct a typo: AntiSpamNotFriends should be AntiSpamNotFriend
Fix creating dummy ui warning on the login panel

Part of my ongoing work to fix enter not working on the login screen
Fix Tobi Genesis' issue of the console sitting over the login fields after a failed login when hiding login screens.
Eep, this escaped the dummy ui warning commit yesterday.
Fix focusing marked via the radar menu not working
Fix Issue 938: Pressing enter on the login screen doesn't log in

Fixes side issue with location combo's focus not being lost during onClickConnect
Merge branch 'master' of https://github.com/MelanieT/SingularityViewer
Typo fix: onPatialExportConfirm should be onPartialExportConfirm
Typo fix
Allow multi select on the group members list in the general tab (How did this slip by me?)
Fix StockMaster's issue of the radar alerting ten seconds after avatars have departed
Fix squares showing up on God Tools floater because of tabs being used for xml spacing
Fix Issue 992: Singularity will not allow teleports above 4096, nor building above 4096.

Teleport height restrictions have been increased to 8192
 -The 4096 limit isn't in much of the teleport code anyhow, and it's certainly not enforced.
Building height restrictions are now hooked up to hippolimits, apparently they hadn't been
 -MAX_OBJECT_Z, and hardcoded 4096s now use gHippoLimits->getMaxHeight() instead
 -On floater_tools.xml max_val is left out, instead it is set with the rest of the gHippoLimits edit constraints in LLPanelObject::getState
Fix the spinners on the map and on the god tools floater being too small because of unused label_width.
Add default object texture id to perms check
Fix the load button on web tab of profiles not working, thanks to goldlatias for pointing this out.
Fix the borders of drop targets to look like they did back in 1.8.0