Implement additional aircraft configurations

[NathanVRyver]

Feature

Request
Expand aircraft library with more VTOL configurations for research and testing.

Proposed Configurations

1. Quadplane - Traditional quad + fixed wing
2. Tiltwing - Entire wing tilts with motors
3. Cyclocopter - Cycloidal rotors for VTOL
4. Coaxial+Wing - Coaxial rotors with wings

Implementation

• Add new config files in src/config/
• Define mass, inertia, and actuator properties
• Create aerodynamic models for each type
• Add control mixing for new configurations

Acceptance Criteria

• At least 2 new aircraft configurations
• Each config has validated physics parameters
• All flight modes work with new aircraft
• Example flight tests for each configuration