Fix various bugs

[ghost]

• full support for icv.db type pfs with file tables with more than one pages of signatures (fixes https://github.com/motoharu-gosuto/psvpfstools/issues/21 https://github.com/motoharu-gosuto/psvpfstools/issues/39 https://github.com/motoharu-gosuto/psvpfstools/issues/40 https://github.com/motoharu-gosuto/psvpfstools/issues/42) (see PR https://github.com/motoharu-gosuto/psvpfstools/pull/47)
• fix wrong destination path (https://github.com/motoharu-gosuto/psvpfstools/issues/27)
• fix sce_sys wrongly excluded (https://github.com/motoharu-gosuto/psvpfstools/issues/22)
• fix padding not being trimmed in decrypted files from icv.db type pfs

[motoharu-gosuto]

@cuevavirus

Thank you for hard work! I would need some time to go through fixes. It is great, how much were you able to fix. It is also good that you have merged into io-api branch.

[motoharu-gosuto]

Also - I can not approve c09f2935f12e5b45ac992af6975fb932077dbccc right now. It contains lots of core changes, which will require some time for me to remember and understand.

[ghost]

I rebased 048edbfe out of this pull request. When this PR is merged I will open a separate PR for that.