Ignite v0.7.0

Changes:

• Bumped mixin to 0.8.5.
• Bumped jline to 3.21.0.
• Bumped gradle wrapper to 7.3.1.

Additional Features:

• Added libraries property, which will scan directories inside the target and add any jars to the system classloader.
• Added paperclip service to support 1.18+ (paperclip 3) and moved the existing service to legacy_paperclip.

Bug Fixes:

• Removed deprecated SecurityManager in new paperclip service, to fix #71 and used an ASM solution to replace System#exit calls instead.
• Don't add engine or launch targets to the system classloader when adding mod containers.