Delegate generic utils from Ragger to Ledgered

[lpascal-ledger]

Some generic utils such as derivation path parser ought to be here, rather than Ragger.

ragger.utils.misc

These following functions could be methods of an App (debatable name) class that could infer these information from the manifest:

• find_library_application
• find_main_application
• find_project_root_dir