Rework config editing resolution to search all config files

Fixes missed edits when no config files are found.
Sort mods by priority based on amount of content

Helps reduce 'immobile' IDs which have to be configured manually
(e.g., Forgotten Nature's contiguous ID requirements).
Add configurable mod priority
Fix missed configs in subdirs during mod analysis
Switch to non-inline comments for .cfg
Fix getConfigFiles() on nested configs
Add isItemBlock to dumpItems()
Enable item ID resolving