Basic showActionSequence Move Action support

IMPORTANT: There is no support for actions other than movement in this
update

Removed declarations that are not going to be used
Added declarations for Actions to display
Added declarations for move speed and unit elevation above the board
Completed basic move action showing support in the update method (not
other actions are yet supported)
Replaced duplicate code in generateMap() with a calls to relevant method
Simplified showActionSequence() method