Update LSL mode

This pull request replaces ajaxorg/ace#1469

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changes in `/lib/ace/mode/lsl_highlight_rules.js`:
- added stuff from RC Le Tigre 13.06.06.277104
- made stuff more readable while staying within 80 columns width

changes in `/lib/ace/snippets/snippets.lsl`:
- sorted
- added stuff from RC Le Tigre 13.06.06.277104