Refactor math for no good reason; I just really like math

src/math.zig

@@ -1,4 +1,5 @@
 pub const Matrix4x4 = @import("math/Matrix4x4.zig").Matrix4x4;
 pub const Quaternion = @import("math/Quaternion.zig").Quaternion;
+pub const Vector2 = @import("math/Vector2.zig").Vector2;
 pub const Vector3 = @import("math/Vector3.zig").Vector3;
 pub const Vector4 = @import("math/Vector4.zig").Vector4;