JoyRant build 40

* Added spam detection!
* Fixed weird black background in encountered users view
* Fixed aspect ratio of placeholder user image

Spam is detected using a spam score system.
Specific words and patterns increase the score and once a threshold is reached, the rant is considered spam.

In the feed spam rants will be less visible (max 3 lines of text, smaller and half transparent text and no images) but you can still open the rant (maybe to check the full rant to see if it is really spam) and downvote.

This can be disabled in Settings but is enabled by default.

It’s phase 1 of the spam related feature.
I will approach phase 2 later since it‘s low priority for me.

Feel free to contribute to the spam detection config file via PR:
https://github.com/WilhelmOks/...