Redesign scripts

[Finchiedev]

The following scripts have been added:

• lint.py: Lint all (or specific) parts of the code, checking against multiple linters
• install.sh: Install all of the GUI components with a single command
• Yarn electron-builder: Package RoboHUD as an AppImage for distribution to non-developers (it is very easy to expand to Windows & MacOS)
• Travis CI: Now not broken! The build matrix includes 2 stages - lint & package the application, publishing to GitHub releases on tagged commits