feat: add level loading system

[joshuawalker3]

add LevelLoadPlugin to enable automatically loading levels from an LDtk project

Objective

Fixes #4 The objective is to create a way to automatically load levels from an LDtk project to allow for faster development times by designing levels in LDtk and parsing the data in.

Solution

Created LevelLoad plugin that handles the parsing of LDtk project data in and creating the level

New components

• Player component: Holds pointer struct and bundle applied to entities loaded by LDtk with the Player flag
• Collidable component: Holds pointer struct and bundle applied to entities loaded by LDtk with a value of 1 in the intgrid

New systems

• LevelLoadPlugin: Plugin that handles the parsing of data into the game from an LDtk project.
• world_setup: Creates a camera entity and parses data from LDtk project into the game.
• player_setup: Queries for new entities added with the Player pointer struct and initializes them.
• collidable_setup: Queries for new entities added with the Collidable pointer struct and initializes them.

Testing

• Tested by verifying data is correctly parsed in and displayed on screen
• Tested player responds to control input and collides with collidable objects
• Tested HealthBundle properly applied to Player on initialization by querying for entities with Player pointer struct and Health component. Verified again by decreasing health every Update and verifying health decreased as expected.