Add feature "project-words-filter"

[Masaabu]

Remove or blur from the search page any projects that contain words you do not want to appear in the title.

[MaterArc]

Looks good so far! This seems like a nice feature, I did, however, make a couple of changes to make it even better! I noticed some more tiny things that I will try to fix later this evening and hopefully we can get this in as a version feature soon!

[MaterArc]

The filter input box should also support spaces in between items. When seeing that they are separated by commas, it should also allow spaces.

[Masaabu]

Currently, the filter only works for project titles. Do we need the ability to filter by user name as well?

[mrrfyW]

I was just thinking about making a feature like this! This was kinda done with Anti-Generic, but it would be great if they were able to be specified by the user.

Also, what if this feature makes it so the user can decide which keywords need their thumbnails blurred or the projects filtered, as well as another thing where it gets the instructions/description of the project via the https://api.scratch.mit.edu requests made when using the explore/search page and removes them based on those descriptions as well? I think both of those additions would make this feature better.

Oh, and also make a version for the studios page and user accounts