Overhaul IDE run configurations

[Matyrobbrt]

This PR overhauls run configs by:

• making running prepareRunX configurable (previously this task was never even run for eclipse)
• adding an option that will copy gradle resource output to the IDE-specific out folders (bin / out)
• allowing the generation of run folders, which for IDEA will group all the configurations for a project, and for Eclipse will append the folder name to the .launch files

A possible idea was also having a FG-specific configuration file (that documents all the available options) that is not tracked by VCS, which allows the end user to independently configure IDE-specific FG settings, though that is still undecided.

[Matyrobbrt]

At the request of @SizableShrimp, this PR has been merged with #866.

[TheCurle]

Second

[Matyrobbrt]

Suggestions applied.

[SizableShrimp]

Completed in ForgeGradle 6.