[FIX] add scrollbar to filters menu if needed (web client)

the filters menu can quickly grow if the user adds many conditions.
Once it grows out of the screen, the lower buttons can not be reached
anymore.  This patch adds a vertical scrollbar to fix this issue.  It
has to use some javascript to update its max-height property.
[FIX] UI fix: ungroup 'edit' and 'create' (web client)

ungroup these buttons in form view.
[FIX]issues in event

[IMP]improved reporting and android tip

[IMP]remove event's ticket form menu from customize menu on website
[IMP]improved if seats_max > 0 in tickets then make seats_availability as limited and seats_max is number of total of seats_max of tickets, if seats_max is 0 then make it unlimited in registration tab, and make registration fields readonly if tickets types exist. and make changes for unlimited on website.