Use single library files instead of keeping function declarations in a seperate file

lib/raylib-zig-math-prelude.zig

@@ -0,0 +1,17 @@
+// raylib-zig (c) Nikolas Wipper 2023
+
+const rl = @import("raylib-zig.zig");
+
+const Matrix = rl.Matrix;
+const Quaternion = rl.Quaternion;
+const Vector2 = rl.Vector2;
+const Vector3 = rl.Vector3;
+const Vector4 = rl.Vector4;
+
+pub const float3 = extern struct {
+    v: [3]f32,
+};
+
+pub const float16 = extern struct {
+    v: [16]f32,
+};