[TASK] Reformat code on all php files
[TASK] Replace deprecated method calls
[TASK] Adjust PHPDoc and whitespaces
[BUGFIX] Replace deprecated method strip_tags
[TASK] Remove trailing php tag
[TASK] Remove XCLASS registration
[TASK] Remove usage of globals
[TASK] Remove manual.sxw
[BUGFIX] Remove require_once of non existing class