Address Issue 1761: Grid status from Help menu

Adds Grid Status... item to Help menu

Translators:
add WebLaunchGridStatus notification translation to notifications.xml
add Grid Status... menu item translation to menu_viewer.xml and menu_login.xml

Adds menu visibility function "VisibleSecondLife" for hiding things that shouldn't be shown on OpenSim
Hides SL issue tracker and wiki menu items on non-SL grids
Can haz groups left count in groups list.

Translators, this is in panel_groups.xml and panel_groups_horiz.xml called groupcount

Inspired by Alchemy<3
Don't hide the tab container for classifieds (especially not at the wrong time)

Thanks to Aztek Aeon for pointing out this bug!

Includes random stylistic fixes. (everywhere~)
Better the cmdline_partial_name2key function

Just style fixes and opts.
[Radar] Attempt to fix the rare spamming of left/entered messages
Map all the people!
Feature Request: Copy URI button in avatar profiles

This takes the copy key button's place... if this is bad, I'll figure something out down the line.