remake of remake of Konami's Knightmare

[Taylor Hillegeist]

On Monday, 11 December 2017 at 19:34:56 UTC, ketmar wrote:
> major update: entity logic is completely driven by external
>...
> you're welcome to study MES compiler implementation if you 
> like. it is contained in one file (mesengine.d), and is not 
> that hard to follow.

I hope you didn't write that all in one sitting, I thought it was 
going to be a bit shorter.