GuildEventManager

Added double clik on event header in details display to return to the event list
Modified Grid header click to sort the clicked column, CTRL click to add a new column to the existing sorting
Added a close button in the event details display
Added FAQ and changelog display in the help tab
Added some FAQ topics
Added a close button to the dropdown lists and menus
Added a button to open event details in 'Minimal' display type
Fixed localisation for dates in grid
Fixed removing weekday in grid not working
Fixed deDE localisation typos for classes
Added GEM3UI_FAQ_register(name,source) in order to register FAQ or changelog to the help display
Added display once of lastest changes out of the changelogs
Fixed a bug in the Grid library causing a frame to not hide properly and disturbing mouse actions on the screen