Shields about cdogs-sdl HOT 3 OPEN

This is an interesting question as the shield might be a different entity type.

Recall that the game has various entity types with respect to collision: mobile objects, objects, actors and tiles (walls, doors). Mobile objects and actors collide with everything else, but the collisions have different behaviour depending on type. Mobile objects do not collide with each other, but actors do.

For shields, they have to collide with mobile objects, but probably not anything else. There is no current entity type that satisfies this, so shields must be in its own type. It could be a special type of object too, but note that object has some restrictions such as inability to move.

This raises the question of whether there could be other weapons that could fall under this category - some deflector bullets perhaps?

Then there's the question of exactly how to implement the shield entity. If it were a forcefield then we can have a static entity that is constantly created and destroyed, giving the illusion of moving with the player. Will this work for traditional-looking shields, or will it have to be a custom entity type that moves with the player?

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There's another option, for more of a "force field" feel. In Little Fighter, one of the characters has the ability to create a force field that reflects all energy shots. This is easier to implement, although it has custom collision logic - don't collide with teammates, collide (and hit) enemies, and reflect mobile objects (also changing its owner!)

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Need to implement #472 first

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