Add custom fields into models
wip: add Custom Field
add display mode to MultiText config
fix InputSystems Add and Remove names not showing
can add custom fields to config (but not displayed yet)
display custom fields in Field Config picklist
preempt merge from master
Merge remote-tracking branch 'lf/master' into feature/customFields

Conflicts:
	src/angular-app/languageforge/lexicon/views/configuration.js
	src/models/languageforge/lexicon/config/LexiconConfigObj.php
	src/models/languageforge/lexicon/config/LexiconMultitextConfigObj.php
Merge remote-tracking branch 'lf/master' into feature/customFields
Custom Field configuration can now be persisted
Merge branch 'master' into feature/customFields

Conflicts:
	src/angular-app/languageforge/lexicon/views/configuration.js
hide Field Configuration debug data