It depends on `eval` which is unsafe.

Otherwise we lose the MUC session upon reload.

when using converse.js inside a webcomponent

* Translated using Weblate (German)

Currently translated at 94.0% (268 of 285 strings)

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

* Translated using Weblate (Chinese (Traditional))

Currently translated at 35.7% (102 of 285 strings)

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

* Translated using Weblate (German)

Currently translated at 98.9% (282 of 285 strings)

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

* Translated using Weblate (Russian)

Currently translated at 60.3% (172 of 285 strings)

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

* Translated using Weblate (French)

Currently translated at 100.0% (285 of 285 strings)

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

* Translated using Weblate (Russian)

Currently translated at 100.0% (285 of 285 strings)

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

* Translated using Weblate (Portuguese (Brazil))

Currently translated at 90.5% (258 of 285 strings)

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

* Translated using Weblate (Portuguese (Brazil))

Currently translated at 91.2% (260 of 285 strings)

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

* Translated using Weblate (Portuguese (Brazil))

Currently translated at 100.0% (285 of 285 strings)

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

* Translated using Weblate (Russian)

Currently translated at 100.0% (285 of 285 strings)

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

* Translated using Weblate (Portuguese (Brazil))

Currently translated at 100.0% (285 of 285 strings)

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

* Translated using Weblate (Ukrainian)

Currently translated at 60.3% (172 of 285 strings)

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

1. Add a new `view_mode` value: `embedded`.

   This value is used to determine wether the `converse-muc-embedded`
   plugin is active or not.

2. Remove the need for the #converse-embedded-chat element.

   Instead we reuse the #conversejs element and embed inside that.

3. Removed the need to manually blacklist core plugins

   This is now done automatically if `view_mode` is set to `embedded`.
   Perhaps eventually we don't blacklist at all and instead use the
   `enable` plugin method. For some that probably won't work, like
   `converse-chatview`, which we still need to be active.

Setting it on `window` is necessary to have it available inside a
webcomponent.

Triggering an event is necessary so that we don't call
`converse.initialize` too early.