New Features Full Screen for Lessons containing only slides

Theme customization Fixes

#2188439: [1.5] Adding files to questions

#2185205: [1.5] Change Question to Step

#2187611: [1.5] Chat app duplicate public chat room.

#2185189: [1.5] EntityMalformedException if editing Quiz and users are in the middle of taking it

#2188433: [1.5] File app prefixed databases

#2187587: [1.5] Get correct context for group entity reference

#2188445: [1.5] Hide all question types quiz reference field

#2189289: [1.5] JS error when creating a file "Uncaught TypeError: Cannot read property 'top' of null "

#2186385: [1.5] Og Course Permissions

#2185197: [1.5] Quiz import not setting author

#2190401: [1.5] Add color module to dependencies Opigno LMS