[FL-520] Filesystem Api and App (#280)
* update fatfs integer types
* fix sector size to 512
* fix sector size calculation
* common fs api
* fs api realization (sd card + fat fs)
* better sector size definition
* more api realization fns
* add error description api, add common api
* fix api flag naming, run app
* add fs_info call
* disable fatfs strfuncs, enable fatfs chmod
* rework filesystem app
* sd detect cycle, sd menu, sd eject feature
* fix sd detect cycle
* sd card format routine
* ui improvements, sd info routine
* properly unmount card
* separate mode flags
* add api folder, move app, rename app
* fix api naming
* update st-card-test to use api
* update path to app
* fixed potential problem of using sizeof union
* updated api documentation, new time/date fns
* update codeowners
* changed app requirements
* changed app order
* sd insert/remove log
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