[KIL] xajax removal: First pass of removing Xajax.
3rd party library link disconnected and support files removed.
"loadComponent" functionality removed.
Remaining dependant features' (gmap, webmail, shoutbox) ajax operation disabled and marked with AJAX_TODO comments.
[KIL] xajax removal: Part 2 - feature_wiki_save_draft
Table tiki_page_drafts not removed to preserve existing data but removed from tiki.sql for new installs.
Script in devtools started for manual removal.