[Done] WallMech enemy

[godofgrunts]

Working on #219 with @Charbomber as the designer.

Here is a gif of the current implementation

Currently the WallMech AI acts in the following manner:

• Has a move_direction and shoot_direction which are exported vars.
• Will continue on its path until it hits a collide-able object, then reverse direction
  • Currently will bounce off the player as well, will fix later
• When WallMech is ready to attack (3 seconds after it begins moving) it will:
  1. Stop moving for 1 second
  2. Fire
  3. Cooldown for 1 second
  4. Begin moving again

I didn't see any particular art work or sound effects for WallMech's bullets so I reused the Bub enemy's asset. That can easily be changed.

TODO:

• WallMech doesn't have health
• Nothing related to WallMech's death is handled
• Stop WallMech from bouncing off player (needs testing, but I think I just need to remove the player mask)

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[godofgrunts]

An interesting "problem" has come up. I think most of the world is set to layer 1 which is labeled as "player". Turning that off causes WallMech to go through the world...

I think I might, as a temporary fix, makes a special exception for the player, but I think the baseblock needs to be changed. Might make another commit for that.

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[godofgrunts]

Added a "flashing" animation (modulates the alpha channel on the sprite) to indicate the enemy has been hit. Enemy needs to be hit 3 times before dying. Not sure if @Charbomber wants a death animation yet.

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[godofgrunts]

I've confirmed with @Charbomber that the enemy acts as desired and is ready for merging.

This closes #219

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