~xdavidwu/saf-sftp

README: update long outdated status
SFTPProxyFileDescriptorCallback: support read of size > 32768
MainActivity: connection test: block ui when connecting
add editorconfig
MainActivity: connection test: show key in monospace
MainActivity: connection test: show key fingerprints
MainActivity: connection test: fix success message
MainActivity: connection test: print host key

does not store and verify it in SAF yet, but it is a step forward
MainActivity: run connection test on another thread
MainActivity: add a button for testing connection
SFTPDocumentsProvider: set dummy flag

we do not support any of the flags yet, but this should prevent
DocumentsUI with docinfo from crashing
SFTPDocumentsProvider: unify stat filling
SFTPDocumentsProvider: make title url-ish
SFTPDocumentsProvider: append mount path to title
SFTPDocumentsProvider: do not add port to title if canonical
SFTPDocumentsProvider: add summary
SFTPDocumentsProvider: correct connection resetting
SFTPDocumentsProvider: proper error handling
SFTPDocumentsProvider: refactor toasting
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