VB.NET implementation of the lz-string JavaScript library

This is a port of version 1.4.1 of the lz-string JavaScript library to VB.NET.

At the time this was created, the C# port (lz-string-csharp) was occassionally giving incorrect outputs. My goal was to exactly match the outputs coming from the original lz-string. The port reflects that, with the code being nearly identical to the original implementation.