Isolate parts of the json parser
JSON parser refactoring
Moved json parser to a VirtualApp class
Added composite model generation
Re-init models list in the virtualapp constructor
Added model rules
Merge branch 'develop' into feature/relation-properties
Added per-field rule
Merge branch 'develop' into feature/relation-properties
Added template for contributes types
Refactor properties backend
Remove useless include
Fixed input border
Updated bootstrap ui
Added better datetime support
Added add_rule method and reverse field properties status
Added backward relationship properties
Added modal's footer bg
Added modals to loaded stylesheets
Updated modal templates