DungeonRush: Zig Edition (Alpha Builds)

• First official Zig release of DungeonRush
• 98% rewritten to Zig
• Scores not yet implemented
• Multiplayer not yet implemented
• Various segfaults, undefined behavior fixed
• Many memory leaks fixed
• Some minor improvements to the code
• Replaced Doubly Linked List C ADT with Zig's generic version
• Added new hero voice sound effects
• Added frame rate throttling
• Full screen mode
• Window resize mode
• Recolored one of the heroes to look like the Zig iguana mascot.
• Many, more improvements to the code