* fixed several deprecation notices and warnings from MySQL8, most notably:
- SQL_CALC_FOUND_ROWS: stopped using DBSimple::selectPage and query 'SELECT COUNT(*) ...' separately where needed
- ON DUPLICATE KEY UPDATE ... VALUES(): use row alias for new values instead of VALUES function
- boolean shorthands to long form (&& -> AND, etc)
* convert configuration from list of constants to object
* fixes config changes not applying on cli whithout closing and reopening again
* config variables are no longer embedded in localization text
* append a filemtime timestamp to js/css files to work around browser caching after update
* shuffle script handling around a bit
* also user pages cant have community content
* also fix breadcrumbs on items page
