Release 7.4.0: Introduced capability to signal if a file store is available or not

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Introduced capability to signal if a file store is available or not.

File 'permissions.properties' is therefore enhanced by property com.openexchange.capability.filestore which defaults to true:

# Signal if file store is available or not
# Default is true
com.openexchange.capability.filestore=true

Thus, services can be ranked/enabled depending if a file store is available.