Update desktop CLI functionality to do RAW conversions

[amateusz]

This is a slight refactor, but mostly double checking and filling in the gaps in the X-RAW Studio protocol
It makes it almost usable to convert pictures from the command line.

note: I struggled a lot with the limitations of C, I kind of want to keep the fudge as an C API and write fudge-cli and fudge-gui as C++/? apps.

@petabyt TBH i didn't check whether my changes (mostly to the libs) are affecting Android build. Could you?

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my vision has crystalized to do this afterwards:

1. complete fudge-cli as a CLI replacement of X-RAW Studio, to be able to have some photo-editing workflow.
2. write an QT/web GUI to recreate X-RAW Studio

[petabyt]

Thanks for all the work, I will definitely try and get this merged.

I see you've made a lot of changes to https://github.com/petabyt/fp, do you want to open a pull request there too?

How would you feel about making the desktop/cli application a separate repository? This is kind of necessary in order for desktop/android releases to not conflict with eachother (and be developed in different paces)
That way you can have free range to work on this.

[amateusz]

totally. the desktop folder is sitting there a bit like an orphan.
fudge will then become an mobile app (XApp compat) and xxxx wil become an desktop(/web) app (X-RAW Studio compat). both using common libs