removed tests, left code for the prototype
added space background parts
no longer loading unneeded images
added methods for checking if a point is within a rect
refactoring
added a method for fetching max x and y of a rect
added removeAllChildren method to base entity
added functions for direct modification of a vector's components; removeAllChildren function no longer crashes
added functions for direct manipulation of a size's components
added functions for direct manipulation of a rect's components
added a function to check if a rect intersects with another rect
implemented a tile entity
added tests for the tiled entity