A crash may happen removing a keycard reader

[saledjenic]

Short context:

• In order to detect a keycard reader connection on the client side we're starting the same flow in a loop (every 3 seconds) calling keycardStartFlow.
• Since we need to detect a keycard reader removal if the current error (state) is keycard.action.insert-card, we're also using a loop on the client side, by canceling the current flow calling keycardCancelFlow, then wait for 3 seconds, then start the same flow again calling keycardStartFlow.

Use case:
Running the app and plugging in/out a keycard reader, based on above described scenario, appropriate states are displayed:

• app asks to plugin the card reader -> user plugs it in
• app asks to insert a keycard -> user plugs out a reader
• app asks to plugin the card reader -> user plugs it in
• app asks to insert a keycard -> user plugs out a reader
• .
• .
• .
• and so on in a loop till the card gets inserted

Issue:
In some point while user is plugging in/out a keycard reader the app crashes (doesn't happen often, like once in 15-20 tries) getting the following log from the keycard library:

[bitgamma]

should be fixed now, since this is also concurrency related and now all PCSC functions are gated through a single thread