Add a scaling tool to scale between the different units in Halo Modding

[ShellyHerself]

Create a tool (and set of functions) that can scale models between Halo, 3dsMax, and Metric.

• Halo 1x
• 3dsMax 100x
• Metric-Meters 3.048x
• Metric-Centimeters 304.8x

It's easier to work with Blender when using the intended units, so we should default to those and give people options to scale their models from and to other units.

The model and its nodes should not have their scale numbers touched. Their positions and vertices should be the only thing that is touched. This is because scaling nodes can cause issues in Halo if not intentional.