bugfix: Allow attacking with CANNOT_MOVE flag

[b3brodie]

Summary

Bugfixes "Allow attacking with CANNOT_MOVE flag"

Purpose of change

Melee attacking should be doable with CANNOT_MOVE flag

Describe the solution

Since melee attacking is determined in the move method, the method cannot immediately return on presence of CANNOT_MOVE. Instead, move this check to after the melee attack portion.

Also, add a message warning players that they cannot move if they attempt movement to give feedback.

Describe alternatives you've considered

N/A

Testing

Added a test CANNOT_MOVE effect and confirmed that I could attack monsters next to me but still could not move.

Additional context