Not strictly necessary for vanilla Converse, but makes life easier
downstream

filter
find
has
isEmpty
isString
isUndefined
noop
reject
uniq

Use of lowercase letters and Infinity to avoid calculation errors when the index is -1

- The `converse.api.query` method now no longer accepts an RSM instance.
- The RSM class now separates `query` parameters from `result` attributes
- Improve JSDoc docs and remove need to make `converse-rsm` a plugin
- Add typedefs for the options expected by RSM and `api.archive.query`

This reverts commit 5a874a49.

and render directly from those

Instead of doing it higher up in the chat view (which requires more
function calls and iterating through all messages).

Fixes #2244 by checking if image already is in the `data:` format.

Currently translated at 99.6% (500 of 502 strings)

Translation: Converse.js/Translations
Translate-URL: https://hosted.weblate.org/projects/conversejs/translations/fr/

Currently translated at 99.2% (498 of 502 strings)

Translation: Converse.js/Translations
Translate-URL: https://hosted.weblate.org/projects/conversejs/translations/zh_Hant/

Currently translated at 0.1% (1 of 502 strings)

Translation: Converse.js/Translations
Translate-URL: https://hosted.weblate.org/projects/conversejs/translations/da/

Currently translated at 100.0% (502 of 502 strings)

Translation: Converse.js/Translations
Translate-URL: https://hosted.weblate.org/projects/conversejs/translations/pt_BR/

Currently translated at 100.0% (502 of 502 strings)

Translation: Converse.js/Translations
Translate-URL: https://hosted.weblate.org/projects/conversejs/translations/it/

Currently translated at 100.0% (502 of 502 strings)

Translation: Converse.js/Translations
Translate-URL: https://hosted.weblate.org/projects/conversejs/translations/gl/

Currently translated at 99.2% (498 of 502 strings)

Translation: Converse.js/Translations
Translate-URL: https://hosted.weblate.org/projects/conversejs/translations/de/

Instead of overriding createChatBox, set 'hidden' flag via defaults