Reference_One->addTitle() changes

[DarkSide666]

• addTitle() should return new Expression field not Reference_One instance;
• addTitle() should have ability to pass $defaults to expression field;
• addTitle() shouldn't set read_only=false, expressions should always be read_only=true. And no need for never_save=true here if we already set read_only=true;
• addTitle() should by default advice UI to not show title field in forms as editable field. This can be overwritten by passing $defaults in addTitle() method.

[romaninsh]

I disagree with the point 1.

$this->hasMany(..)->addTitle()->addFields()..

returning the title itself does not give us anything. We can suggest user to look into addField() if they want to do something fancy.

[romaninsh]

I recommend adding: withTitle() same format as addTitle but would return Reference the way how addTitle works now.

[DarkSide666]

agree, implemented: ed03e3b