0.6.1: Foundation blocks and Vulkan fix

It's been a slow few months of development, with a number of sicknesses slowing things down, and some big tasks requiring the update of a lot of assets. But we finally have an update!

I had planned to work on more features first, but this contains a fix for the graphics driver related crash which needed to be addressed quickly. So we're getting foundation blocks and 1x1 floors a little early, and more content and gameplay features are not too far away.

New in 0.6.1:

• Adds foundation blocks as a new option for building

• New textures for mud brick and stone block walls, floors, roofs and paths

• Adds 1x1 floors

• Improved frame rate

• Mud brick structures now degrade much slower in rain

• Fixes graphics driver related crash

• Fixes a bug where tile paths were not rendering some of the tiles

• Fixes bug not being able to plant close to garlic

• Lowers the population soft limit to 150 from 200