Switch root namespace to "RobloxFiles"

In case there are any future libraries written for Roblox in C#, I want to avoid running into any namespace collisions. Its best to keep everything pertaining to this project nested in its own unique namespace.

DataTypes/NumberRange.cs

@@ -1,6 +1,6 @@
 using System;
 
-namespace Roblox.DataTypes
+namespace RobloxFiles.DataTypes
 {
     public struct NumberRange
     {