Parameter types (#4935)

* Add fields to PartParameterTemplateModel

- checkbox: Is the field a 'checkbox'
- choices: List of valid options

* Update javascript

* Adds unit test for PartParameterTemplate

- Checkbox cannot have units
- Checkbox cannot have choices
- Choices must be unique

* Improve API filtering

- Add "has_choices" filter
- Add "has_units" filter

* Prune dead code

* Update js functions for creating / editing parameters

* Update part parameter form

- Rebuild the "data" field based on the selected template
- Supports "string" / "boolean" / "select"

* Adjust data input based on parameter type

- Choice displays available options
- Checkbox displays boolean switch
- Otherwise displays text input
- Adds more unit testing
- Updates to forms.js for improved functionality

* Calculate numeric value for boolean parameters

* Update docs

* Bump API version

docs/docs/part/parameter.md

@@ -10,25 +10,41 @@ Part parameters are located in the "Parameters" tab, on each part detail page.
 There is no limit for the number of part parameters and they are fully customizable through the use of [parameters templates](#parameter-templates).
 
 Here is an example of parameters for a capacitor:
+
 {% with id="part_parameters_example", url="part/part_parameters_example.png", description="Part Parameters Example List" %}
 {% include 'img.html' %}
 {% endwith %}
 
 ## Parameter Templates
 
-Parameter templates are used to define the different types of parameters which are available for use. These are edited via the [settings interface](../settings/global.md).
+Parameter templates are used to define the different types of parameters which are available for use. The following attributes are defined for a parameter template:
+
+| Attribute | Description |
+| --- | --- |
+| Name | The name of the parameter template (*must be unique*) |
+| Description | Optional description for the template |
+| Units | Optional units field (*must be a valid [physical unit](#parameter-units)*) |
+| Choices | A comma-separated list of valid choices for parameter values linked to this template. |
+| Checkbox | If set, parameters linked to this template can only be assigned values *true* or *false* |
 
 ### Create Template
 
+Parameter templates are created and edited via the [settings interface](../settings/global.md).
+
 To create a template:
 
 - Navigate to the "Settings" page
-- Click on the "Parts" tab
-- Scroll down to the "Part Parameter Templates" section
+- Click on the "Part Parameters" tab
 - Click on the "New Parameter" button
 - Fill out the `Create Part Parameter Template` form: `Name` (required) and `Units` (optional) fields
 - Click on the "Submit" button.
 
+An existing template can be edited by clicking on the "Edit" button associated with that template:
+
+{% with id="part_parameter_template", url="part/parameter_template_edit.png", description="Edit Parameter Template" %}
+{% include 'img.html' %}
+{% endwith %}
+
 ### Create Parameter
 
 After [creating a template](#create-template) or using the existing templates, you can add parameters to any part.
@@ -51,12 +67,6 @@ To access a category's parametric table, click on the "Parameters" tab within th
 {% include 'img.html' %}
 {% endwith %}
 
-Below is an example of capacitor parametric table filtered with `Package Type = 0402`:
-
-{% with id="parametric_table_example", url="part/parametric_table_example.png", description="Parametric Table Example" %}
-{% include 'img.html' %}
-{% endwith %}
-
 ### Sorting by Parameter Value
 
 The parametric parts table allows the returned parts to be sorted by particular parameter values. Click on the header of a particular parameter column to sort results by that parameter: