Updated enemy classes to extend EnemyObject; LinePathing AI applied to each enemy type.
Merge branch 'master' of https://github.com/Markwallow/Pull

Conflicts:
	src/pull/Controllers/Objects/GravityEnemy.h
	src/pull/Controllers/Objects/HorizontalEnemy.h
	src/pull/Controllers/Objects/StandardEnemy.h
	src/pull/Controllers/Objects/VerticalEnemy.h