Check modpack directory for manifest file
Check whether any of
manifest.json
minecraftinstance.json
config.json
mmc-pack.json
instance.cfg
modrinth.index.json
exist. If they do
- ask the user whether they want values from these to be loaded.
- display comparison of values which will be loaded to current settings
- allow selection of values to load
- offer to load all
- offer to refuse