Pending messages might just resend unload bomb without user pressing button

[mcr222]

The messages that could not be sent are stored and tried to be resend. For the unloadBomb messages this might not be a good idea, since it might resend messages uncontrollably. I think that one approach would be to treat separately unloadBomb messages, since there are other issues (like sending to multiple phones the bomb).

Additinally: //TODO: important, no resending messages of unload bomb when phone is locked, since then it bomb could be
//TODO: send by the phone when resending messages (this case is protected by the fact that messages are only
//TODO: resend when user presses send button