Add option to add own search engine

[BlobCodes]

Is your feature request related to a problem? Please describe.
Normally, when browsing, I use the search engine qwant.com or lite.qwant.com, so I wanted to change wexond's search engine to it. After some searching, I came to the conclusion that this is not possible right now.

Describe the solution you'd like
An "Add search engine" button in the address bar menu.
Also, a "recently visited search engines" feature could save the user some time and could improve the user experience, but this is not really a "must-have".

Describe alternatives you've considered
None.

Additional context
None.