Suggestion allow uploading .jar files to community content

[Megacrafter127]

Currently .zip .txt .pdf .png .jpg .jpeg .jpe .gif .sment .smtpl and .smsec are allowed file suffixes. I suggest also allowing .jar as a file suffix, for the following reasons:

1. The file format of a jar is already allowed to be uploaded [.zip]
2. It allows modders to upload installers for their mods, if the installation requires several or complicated steps. Currently, that is only possible by uploading the file to another service, and setting the community content to refer to said service. The same goes for 3rd party tools.
   Since 1 is the case, one could just rename the file and instruct the users to revert the suffix change, but some operating systems don't allow that, as it could compromise the file integrity. The other option would be to pack the installer inside a zip, but putting a zip into a zip isn't a good practice.

I originally suggested this in Suggestion - 7z Support, but that wasn't a good place in the end.