Update to Bevy 0.14

[mnmaita]

Issue:

N/A

What was done:

• Updated Bevy to 0.14.
• Updated all related crates to a 0.14 compatible version.
• Migrated code to 0.14 and refactored deprecated code.
• Removed some unused and unnecessary code.
• Updated the minimum Rust version of the project.
• Updated all dependencies in Cargo.lock.
• Simplified rendering of the debug grid (for dev builds only).
• Optimized some code and systems.
• Implemented StateScoped to replace the entity_cleanup system.

[mnmaita]

TODO:

• Update bevy_particle_systems version once it gets a new release.