wutdevoptab: Use the FSA API instead of FS to avoid softlocks on errors

[Maschell]

The FSClient has the weird behaviour that it softlocks the console once a "fatal" error happend on the fs side. A "fatal" error can be as simple as seeking beyond the actual filesize, well.

The FSA Api returns proper error codes which can be handled instead of soft locking the console. In comparision to FS-API it doesn't support the "Command Blocks" => handling priority or canceling fs operations is not possible, but these feature where not use in the devoptab anyway.

Things left to do:

• Add fixes from wutdevoptab: Fix check for O_UNENCRYPTED flag #251 and Implement support for more flags (combinations) when opening files with the devoptab #250
• Finish the FSAError to errno mapping
• Decide if a OSFastMutex_Lock or a regular OSMutex (std::mutex) should be used.
• Clean up the __init_wut_devoptab and __fini_wut_devoptab functions.
• Decide if we should keep the OSReports on error

Things that can be (easier) implemented after using FSA instead of FS:

• Proper implement lseek

[Maschell]

Rebased to 1.2.0, double checked that all fixes of the "original" devoptab are also present in this PR

[fincs]

Only minor changes required (see comments)