* Don't force text-centering around FIELD_WIDTH if arrow present
* Add dark arrow asset
* Refactor FieldNumber restrictor generator to be static
* Allow disabling of FieldDropDown colour changing
* Add FieldTextDropDown and FieldNumberDropDown
* Add number drop-downs to list blocks
* Add docs
* Update `setArgType` -> `addArgType`
* Ensure arrow only created once
* Update list index min
* Refactor shared components of num restriction
* Line breaks
* Clear touch identifier
* Clear touch identifier when text drop-down closed
* Inheritance simplification