Implement jar scanner to check files for Fractureiser malware

[hypherionmc]

Implement a built in scanner to check for infections from the Fractureiser malware, before uploading.

The scanner is based on the efforts of this tool

[triphora]

Thanks so much!

[douira]

I want to mention that since this PR the detector was updated and some bugs with it were fixed. (such as INVOKEVIRTUAL not being one of the strings in the signature but a typo) See https://github.com/MCRcortex/nekodetector/blob/master/src/main/java/me/cortex/jarscanner/Detector.java for the current state of affairs.

[triphora]

Could the jar scanner maybe be made a library placed on Maven Central? That way we can just pull in the library instead of including it in Minotaur source.

[douira]

Cortex would need to upload the library to Maven Central, I also don't know if this is going to be the long-term solution to the whole static analysis situation. Just wanted to mention that the detector has received some changes for fixing some missed detections.

[hypherionmc]

I'll go compare the code and pr the needed changes. Need to update my plugin as well