converts old file formats to new ones. the package type is detected from its files:

for all types:

• description.txt is moved into the description of the conf file
• locale/*.tr translations are converted to locale/*.po

additionally:

• mods: depends.txt is moved into depends and optional_depends of mod.conf. if a mod has no mod.conf, one is created with name set to the folder name
• modpacks: modpack.txt is replaced by modpack.conf

if an old file doesn’t match what’s already in the conf file, nothing is changed and an error is reported.