add user's systems settings template and css
serialize user's systems settings for AJAX POST
add basic UserSystemModel
show user's systems in settings
user systems UPDATE support
user systems settings: dynamic add form
user system: INSERT new system
user systems: deleting and refresh after save
show user's systems in public profile
fix Model::save method (id was using col. quotes)
switch UserSystemModel from DataObject to Model
show user profile system only if he has any system
WIP #19708
Merge branch 'master' into 19708
WIP #19708
#19708 Fix CSS
Merge remote-tracking branch 'worklist/master' into 19735

Conflicts:
	js/settings.js
	views/mustache/settings.mustache
fixed for bugs and CR notes from #142
reverting mixed changes from another branch for prev commit
Merge pull request #143 from kordero/19670

fixed for #142