* Initial work on #13283
* Enable passing TomSelect HTML template attibutes on DynamicModelChoiceField
* Merge disabled_indicator into option_attrs
* Add support for annotating a numeric count on dropdown options
* Annotate parent object on relevant fields
* Improve rendering of color options
* Improve rendering of color options
* Rename option_attrs to context
* Expose option context on ObjectVar for custom scripts
* Document dropdown context variables
* Clean up base modules
* Clean up forms modules
* Clean up templatetags modules
* Replace custom simplify_decimal filter with floatformat
* Misc cleanup
* Merge ReturnURLForm into ConfirmationForm
* Clean up import statements for utilities.forms
* Fix field class references in docs
* WIP
* WIP
* WIP
* Make object selector functional
* Replace extraneous form fields with selector widgets
* Avoid overlap with filterset field names
* Show checkmarks next to visibile filters
* Update results automatically when searching
* Include selector for device/VM component parent fields
* Use selector for filtering VLAN group/site
* Limit selector to 100 results
