fix: sort subgen list, remove threshold, fix permission issues

[petermuessig]

• Sorts the sub generator list alphabetically
• Removes the threshold of 30 for the list of sub generators
• Fixes the permission issues for installing / updating

Fixes #122 Fixes #118 Fixes #117 Fixes #111

[petermuessig]

@nicoschoenteich - this is FYI - I will release this independently to get the above mentioned issues fixed. You can also take a look later on that.