v2.0.0 Beta 3 testing and preview release

Our third preview release to help find bugs and test incredible new features! 🪲 🚧

Bugfixes: 🐛🔨

• #280: Remove option for node runner from settings. This was causing problems for users without node installed.
• evil-mad/robopaint-mode-edit@2e38709; Fix file API
• #274: Add necessary files for Ubuntu Dash to find the RoboPaint binary.

New Dev Features: 😈 👍

• Use npm to build node-serialport automatically if you are using an architecture without a prebuilt node-serialport binary

Known issues: 🪲

• Due to recent changes to improve smoothness/timing for sending serial commands, the virtualization in "simulation mode" with no bot attached no longer correctly times movements or other commands, so they're executed basically instantly. This will hopefully be fixed with the next iteration.
• #275; Some SVGs render as all black, this is being looked into and is high priority for next release.
• Some SVGs don't parse well and will simply stop rendering for printing. We recommend if this is encountered, let us know in our Gitter chat room and provide the file and we'll try to classify it. Aside from that, if you can for you drawing turn off fill occlusion in settings, it may help.
• The Spiral Paint mode is experimental, and may not work. We ought to have left it disabled by default.

Special note: 🎈

• This is a brand new bugfix snapshot release. It has not been tested as thoroughly as v2.0.0 Beta 2. Please let us know if you encounter anything unexpected, as we work towards our non-beta release.
• Mac users: If you are using a MacOS version prior to 10.12, we recommend that you stick with Beta 2 for the moment.