LibJF

This release essentially contains a completely rewritten config system. While a compatibility layer for mods using the old API is still provided, some dependents may be incompatible without updates. Commits in alpha 3.0.0:

• [config] Tweak config command
• [config] Support loading configs from provided IDs to support changing IDs
• [root] Tweak build scripts to produce clean POMs with current scripts
• [config] Implement config DSL and rewrite reflection implementation
• [unsafe] Fix and remove unsafe.unlock
• [config] Initial prototype for compile-time configs, module name changes and legacy compatibility
• [config] Various fixes
• Merge branch 'config-dsl' into 'master'
• [docs] Move to mdbook and document libjf-config v1 modules