Linked #998.
- In case of full obfuscation we detect the files directly after assembling and rename it such that par2 will pick it up
- Turns out we do need 'partable' to keep track what is the main par2 file
- Handle missing of first par2 file, automatically fetch next one
See #998
- Seperate par2 functions in new file
- Always check for par2-signature if file is not a rar-file
- Always parse par2 contents for signatures (hash -> filename)
- Use the signatures to keep track of par2-packs, not basenames
- Remove seperate 'extrapars' for NZF's, all in the NZO
- Remove 'partable' for NZO, it's all in it's 'extrapars'