Add mod importing from Modrinth, Forge and Fabric

[rtm516]

Fixes N/A

• [x] Tested Changes using phpunit
• [x] Have read and followed the Contribution Guidelines

Adds mod browsing and importing from Modrinth, along with importing of Forge and Fabric versions.

Known issues:

• When parsing a mod json (eg fabric.mod.json) that has a newline in the middle of a string it will fail to load and therefor requires manual importing. This is due to the json file not following the official specifications, see https://stackoverflow.com/questions/34486346/new-lines-and-tabs-in-json-decode-php-7 for more info

Screenshots

> Main import page >  > Fabric import page >  > Forge import page >  > Imported mod details and version selection > 

[Draakoor]

Is this still beeing reviewd looks like a cool feature

[rtm516]

Rebased for cleaner merge