Knife Holster Mk2

Holster for friends knife, it's attachable to straps and the knife is held by matching pins and a neodymium magnet. The goal here was to make the knife to be pulled out easily.

This is a work in progress, planned changes include:
* more rounded corners and a bit thicker walls to keep current strength
* lowering walls near handle for easier removal
* further fill the bottom side near handle
* rounding locator pins so to simplify the knife insertion