(WIP) HDoom Options

We had been planning on this feature for the upcoming update since the last release, but someone beat us to the punch and submitted a working HDoom option menu to my inbox - so after a bit of tweaking with it we got it into the HDoom codebase seamlessly.

I still need to rework some of the phrasing, but i'm looking forward to the gameplay being more customizable now when the next version is ready.

That aside, I'm suffering from a bit of nasty headcold atm but i'm still working on the next few Revenant attack frames which i'll be able to show soon (it's a slow process i know, but she's got a lot of frames and i'm pacing myself so I don't burn out - though i do got a couple tricks up my sleeve to help cut the workload a bit in the near future), and hopefully some new art too!