Fix strings, style, tabulation code,

Fix strings, style, tabulation code,
Improvement of attachments tab

For attachments into event and venue.
review mailer plugin

new version with review/change of Bluefox (thanks) and others small
modification.
Can delete event image & venue image

Include delete event image and venue image from FE.
altered references within descriptions (main controller,backend)
altered contacts/venues functions (editevent, front)

- there are no Orderby/Where functions anymore as they are merged into a
buildQuery
- for contacts there is an additional check for published
removed published column (choosecontact,front)
changed venue/contacts variables (editevent-view, front)
removed obsolete function remove
added new version of iCalCreator
removed Snoopy.class
Altered UpdateCheck (model+view)
removed Snoopy from credits (help)
added IP-setting to edit-models/view (front)
altered referral of IP-retrieving + fixed storing IP (event-model)

- the event-model was missing the IP-storing part.
- the IP variables are pointing to a function within the helper
added modified_by to venue/event-stats (events/venues-view, backend)
added if statement for display IP (venue/event-stats, backend)
renamed elSelectUser function to modalSelectUser
removed obsolete function publish (venues,backend)
removed sockets from pkg_install