modernize, update and pin dependencies, minor functionality

[khimaros]

thank you for creating this awesome software. a few small fixes:

• update to latest glium/glutin
• pin dependencies and fix backtrace-rs link failures with newer rust toolchains
• add "esc" key handler to exit
• add a config option for running fullscreen

[khimaros]

@conundrumer is this pull request of interest to you?

[conundrumer]

Wow sorry didn't see this, thank you!