TODO before merge

• write useful tests
• rewrite the example and add an extensive demo
• benchmark and test performance

This PR introduces a complete rewrite of the vector and matrix libraries with a focus on generic programming, flexibility, and broader applicability. The changes move away from fixed-dimension structures and game-focused assumptions, allowing the libraries to be useful in a wide range of engineering, physics, and graphics contexts.

Key Changes and Improvements

1. Generic NxM Matrices

   • Matrices are now fully generic in both rows and columns, with type Mat(r, c, T).
   • No more hardcoded dimensions; operations like addition, subtraction, multiplication, and transposition work for any compatible sizes.
   • Square-matrix-specific operations (identity, diagonal, determinant, inverse) are compile-time checked for validity.
   • Row-major storage with [r][c]T ensures clarity and consistency.

2. Generic Vectors

   • Vectors support any dimension and numeric type (Vec(n, T)), with convenience operations for addition, subtraction, scaling, dot product, cross product (3D), normalization, and more.
   • RH/LH conventions are explicitly supported for operations that are convention-dependent (cross, rotation, reflection, lookAt).

3. Graphics Utilities

   • LookAt, orthographic, and perspective matrices are preserved, with explicit RH/LH variants.
   • Translation, scaling, and rotation matrices are included and are now convention-aware where applicable.
   • Homogeneous transformations are consistent with the generic matrix API.

4. Clean Architecture

   • The API is consistent, type-safe, and fully generic, removing hardcoded assumptions from the old version.
   • Encourages use in engineering, aerospace, physics simulations, robotics, and general 3D graphics, not only game development.
   • Supports extension for new operations without breaking the existing API.