Complete core functionality

Completed core functionality

• Supports renaming mod sets
• Supports deleting mod sets
• Supports creating new mod sets

It is recommended you do a fresh import of any ModListBackup imports. This version will also import any local attributes associated with MLB mods like colors, local install names, etc. It doesn't do anything with that data yet, but it will gladly import that and keep it available for later use. 'Old' data will not have that information so feel free to replace that 😀