Merge remote-tracking branch 'origin/master'
[REF] lossless image compression 1099kb saved, up to 71% compression. Largely fivealive, business & webmail
[DOC] Pretty tracker registration description
[DOC] Update inline documentation to reflect doc.tiki.org content better
[FIX] Prevent site logo from offsetting to the right of module boundry
[DOC] Add inline documentation about batch user importing
[SEC] - Add index files to vendor files to prevent directory browsing
[FIX] PHP 7.4 - Curly brackets deprecated