[Fix] Mitigate XSS attack vector by cleaning input before it hits our Database (#171)

## Changes

- All text input fields are now cleaned with nh3 to remove html tags. We allow certain html tags under `settings.py/ALLOWED_HTML_TAGS` so we can easily update the tags we allow in the future.
- All names and descriptions now use the template tag `nh_safe` in all html files.
- Usernames and emails are a small exception and are not allowed any html tags

Co-authored-by: Liam Brydon <62733830+MyCreativityOutlet@users.noreply.github.com>
Co-authored-by: jebus <lorsbach@envipath.com>
Co-authored-by: Tim Lorsbach <tim@lorsba.ch>
Reviewed-on: enviPath/enviPy#171
Reviewed-by: jebus <lorsbach@envipath.com>
Co-authored-by: liambrydon <lbry121@aucklanduni.ac.nz>
Co-committed-by: liambrydon <lbry121@aucklanduni.ac.nz>

templates/modals/objects/edit_prediction_setting_modal.html

@@ -32,7 +32,7 @@
                                                 <td colspan="2">
                                                     <select id="model" name="model" class="form-control" data-width='100%'>
                                                     {% for m in models %}
-                                                    <option value="{{ m.id }}" {% if user.prediction_settings.model.url == m.url %}selected{% endif %}>{{ m.name }}</option>
+                                                    <option value="{{ m.id }}" {% if user.prediction_settings.model.url == m.url %}selected{% endif %}>{{ m.name|safe }}</option>
                                                     {% endfor %}
                                                     </select>
                                                 </td>