v0.5 and first release on itch.io

Hello, everyone!

This is a first Itch.io release of a roguelike project I've been working on and off for a couple of years now. Up to this point the game was completely free and open-source but from now on there will be two versions - one with commercial art available on Itch.io and the other one with ASCII art available for free on my website. The web version on Itch is also the same as the desktop download so you're not missing on anything ingame if you do not purchase the binary and just play using the browser.  Codewise there are no significant differencies in the free and paid versions.

Looking back, I see that the previous version was released in July, 2017. Ouch, that was a long time ago, something like a 1.5 year hiatus. So, what changed for this one? Apart from the addition of commercial art, there was an engine change. I've removed all Haxepunk-related code and moved to using much faster Heaps.io.  The city streets are now properly generated in the area mode (before that it was just a collection of random buildings thrown around), there is a structure to the area map.  There are a lot of convenience changes resulting from the feedback: the HUD now displays current player goals, some keyboard commands were changed, config now allows to scale map tiles and there are a lot more messages to the player in the early game stages to hint about various game mechanics that are not obvious.

Currently, the game is completable to the end (and has been for quite some time) but it needs a lot of polish in a lot of  areas.