remove old emojis

[adbenitez]

use modern emoji2-emojipicker instead

close #3399

To Do:

• remove old emoji images assets
• remove "use system emojis" preference
• use emoji2-emojipicker instead of old emoji picker
• implement on-click event in new emoji picker
• fix emoji text views
• delete old emoji code
• fix emoji color for reaction pills
• enlarge font size when text is only a few emojis

[github-actions]

To test the changes in this pull request, install this apk:
📦 app-preview.apk

[github-actions]

To test the changes in this pull request, install this apk:
📦 app-preview.apk

[github-actions]

To test the changes in this pull request, install this apk:
📦 app-preview.apk

[github-actions]

To test the changes in this pull request, install this apk:
📦 app-preview.apk

[adbenitez]

caveats:

• after a lot of searching for solutions I didn't find any proper&easy way to detect emojis in text in java for the font size scaling effect, so if you send a single emoji the message will look the same as any other message, hopefully core could help with this in the future
• the emoji picker doesn't have a delete button, this could be added eventually when we add a row to switch between emojis and sticker picker, that is how it is in whatsapp

[github-actions]

To test the changes in this pull request, install this apk:
📦 app-preview.apk

[link2xt]

Desktop uses code from message parser:
https://github.com/deltachat/message-parser/blob/13efc9be4f6363f02104d88431f6685e6318e29e/src/parser/is_emoji.rs#L143

https://github.com/deltachat/deltachat-desktop/blob/cbb27a89fe91757bd1b7d634ead1fac7ea28d01a/packages/frontend/src/components/conversations/emoji.ts#L57