File transfers example

XXClient

• Make preview property in FileSend model optional.

XXMessengerClient

• Add isFileTransferRunning function to Messenger.

xx-messenger example app

• Implement sending images.
• Implement receiving files.
• Display sent and received images on the chat screen.
• Display the progress of file transfers on the chat screen.

requested review from @brunomunizaf

assigned to @darrarski.xx

changed the description

added 3 commits

• be596e5e...d86934b6 - 2 commits from branch development
• 54f1247d - Merge branch 'development' into feature/example-file-transfers

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marked this merge request as ready

mentioned in commit 3ec374e2

merged