Polychoron 1.0.1 update

This is a minor maintenance update. It has been nearly three months since the release and I have received very few bug reports. I take this as a good sign.

There are some crashes reported on Google Play. Most of them seem to be related bad GLES3 support on old Android versions and luckily they seem to be affecting only a small number of players. I would like to fix these too but they are very hard to resolve unless workarounds are implemented in Godot Engine itself. I did upgrade the engine to latest stable version (3.4) which should at least improve input responsiveness on lower end devices.

Vast majority of the players have been playing the mobile version, which feels kind of weird as I have always viewed Polychoron as primarily a desktop game, best played with mouse and keyboard. I thought playing a 6DoF game on touch screen would be impossible but I'm glad to be wrong. Ratings and reviews have been mostly positive.

Here are the changes since version 1.0.0:

• Changed menu background color to lighter blue.
• Switched to use "weak" vibration motor in gamepads for better compatibility.
• Added an option to disable vibration effects in settings.
• Improved input responsiveness on low-end Android devices.