Single-module structure for library logic

Merge pull request #4 from Peytob/demo

Demo: Added demo noise images generation

Merge pull request #3 from Peytob/noise

Merge pull request #2 from Peytob/rect

Noise: Base noise tests; field interface; curl noise

Noise: Fbm, perlin, worley noises; scale noise2d decorator and noise2d builder

Noise: Noise and random interfaces; gold noise realisation

Rects: Rects operations; vectors optimization and mutable flag

Rects: Rect and MutRect interfaces and realisations

Merge pull request #1 from Peytob/vector

Vectors: NIO Buffer, distance, length, normalize vector operations; toString

Vectors: Vec3 and MutVec3 operations and factories

Vectors: Vec3 and MutVec3 interfaces and struct realisations

Vectors: MutVec2 factories and struct realisations