Pass records by reference to overcome halting event issue

Refs octobercms#1853

Introduce theme logging + log settings

CmsObject changes can now be tracked (disabled by default)
Request logging is now disabled by default (security vector)

Throw an error when framework loads twice

Fixes octobercms#2379

Improve nullable tests

Refs octobercms#2612

Add new config cms.forceBytecodeInvalidation

Refs octobercms#2385

Minor tidy

Bust OP cache for CMS template cache files

Fixes octobercms#2385

Use minified JavaScript for the Media Manager

Further styling improvements

Refs octobercms#2575

Merge pull request octobercms#2566 from sw-double/feature/fix-ru-lang

Fix ru lang for backend users