Builtin plugins (#3889)

* Allow loading of "builtin" plugins, even if "plugins" are not explicitly loaded

* Updates for 'admin' buttons:

- Make them work like proper links
- Hidden if 'hide_admin_link' customization option is set
- Check for user staff status

* Cleanup rendering of "plugins" display

* Consolidate InvenTree barcode plugins into single plugin class

* Hide "install plugin" button if plugins are not enabled

* Add info message is external plugins are not enabled

* Fixes for loading plugins

- Always load 'builtin' plugins
- Refactor calls to "is_active" at various points in codebase

* Various tweaks

- Improve builtin plugin descriptions
- Spelling fixes

* Adjust plugin detail for builtin plugins

* Simplify barcode plugin class

* Simplify template rendering

* Bug fix for inventree barcode plugin

* Revert "Simplify template rendering"

This reverts commit 3a6755a659.

* Re-re-improve template rendering

- Required as the template has been refactored for both "active" and "inactive" plugins

* Fixing unit tests for barcode plugin

* Ensure that barcode scan actions do not take a "long time":

- Add a default timeout of 0.1s to any POST or GET request in the testing framework
- Can be overridden by calling method if desired

* Display plugin "builtin" status in admin panel

* Fix unit tests for plugin API

* Further unit testing fixes

* Version number tweaks

* Further tweaks for unit testing

* Allow longer timeout for report printing via API

* Increase default timeout for API tests

- Sometimes CPU spike can cause the test to fail :|

* label printing can take a bit longer

* Remove timeout requirement from API tester

- Too variable to be reliable for CI

InvenTree/templates/InvenTree/settings/plugin_details.html

@@ -0,0 +1,75 @@
+{% load inventree_extras %}
+{% load i18n %}
+
+<tr>
+    <td>
+        {% if plugin.is_active %}
+        <span class='fas fa-check-circle icon-green'></span>
+        {% else %}
+        <span class='fas fa-times-circle icon-red'></span>
+        {% endif %}
+
+        {% if plugin.human_name %}
+        {{ plugin.human_name }}
+        {% elif plugin.title %}
+        {{ plugin.title }}
+        {% elif plugin.name %}
+        {{ plugin.name }}
+        {% endif %}
+
+        {% define plugin.registered_mixins as mixin_list %}
+
+        {% if mixin_list %}
+        {% for mixin in mixin_list %}
+        <a class='sidebar-selector' id='select-plugin-{{plugin_key}}' data-bs-parent="#sidebar">
+            <span class='badge bg-dark badge-right rounded-pill'>{{ mixin.human_name }}</span>
+        </a>
+        {% endfor %}
+        {% endif %}
+
+        {% if plugin.is_builtin %}
+        <a class='sidebar-selector' id='select-plugin-{{ plugin_key }}' data-bs-parent='#sidebar'>
+            <span class='badge bg-success rounded-pill badge-right'>{% trans "Builtin" %}</span>
+        </a>
+        {% endif %}
+
+        {% if plugin.is_sample %}
+        <a class='sidebar-selector' id='select-plugin-{{plugin_key}}' data-bs-parent="#sidebar">
+            <span class='badge bg-info rounded-pill badge-right'>{% trans "Sample" %}</span>
+        </a>
+        {% endif %}
+
+        {% if plugin.website %}
+        <a href="{{ plugin.website }}"><span class="fas fa-globe"></span></a>
+        {% endif %}
+    </td>
+    <td>{{ plugin_key }}</td>
+    {% trans "Unvailable" as no_info %}
+    <td>
+        {% if plugin.author %}
+        {{ plugin.author }}
+        {% else %}
+        <em>{{ no_info }}</em>
+        {% endif %}
+    </td>
+    <td>
+        {% if plugin.pub_date %}
+        {% render_date plugin.pub_date %}
+        {% else %}
+        <em>{{ no_info }}</em>
+        {% endif %}
+    </td>
+    <td>
+        {% if plugin.version %}
+        {{ plugin.version }}
+        {% else %}
+        <em>{{ no_info }}</em>
+        {% endif %}
+    </td>
+    <td>
+        {% if user.is_staff and perms.plugin.change_pluginconfig %}
+        {% url 'admin:plugin_pluginconfig_change' plugin.pk as url %}
+        {% include "admin_button.html" with url=url %}
+        {% endif %}
+    </td>
+</tr>