Utilize source maps for error improvements

[chrisbreiding]

Closes #3966

[jennifer-shehane]

Hmmm, wonder if we should converge on a PR to work on together for this.

[cypress]

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Test summary

3762 • 0 • 50 • 0

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Run details

Project	cypress
Status	Passed
Commit	ffee0bc
Started	Jan 8, 2020 8:29 PM
Ended	Jan 8, 2020 8:33 PM
Duration	04:43 💡
OS	Linux Debian - 9.11
Browser	Multiple

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[jennifer-shehane]

[desktop-gui:build  ] ERROR in ../ui-components/src/select/select.scss
[desktop-gui:build  ] Module build failed (from ../web-config/node_modules/mini-css-extract-plugin/dist/loader.js):
[desktop-gui:build  ] ModuleBuildError: Module build failed (from ../web-config/node_modules/sass-loader/lib/loader.js):
[desktop-gui:build  ] 
[desktop-gui:build  ]     @extend .#{$fa-css-prefix}-circle-o;
[desktop-gui:build  ]              ^
[desktop-gui:build  ]       Undefined variable: "$fa-css-prefix".
[desktop-gui:build  ]       in /root/cypress/packages/ui-components/src/select/select.scss (line 13, column 15)
[desktop-gui:build  ]     at /root/cypress/packages/desktop-gui/node_modules/webpack/lib/NormalModule.js:302:20
[desktop-gui:build  ]     at /root/cypress/packages/desktop-gui/node_modules/loader-runner/lib/LoaderRunner.js:367:11
[desktop-gui:build  ]     at /root/cypress/packages/desktop-gui/node_modules/loader-runner/lib/LoaderRunner.js:233:18
[desktop-gui:build  ]     at context.callback (/root/cypress/packages/desktop-gui/node_modules/loader-runner/lib/LoaderRunner.js:111:13)
[desktop-gui:build  ]     at Object.callback (/root/cypress/packages/web-config/node_modules/sass-loader/lib/loader.js:52:13)
[desktop-gui:build  ]     at Object.done [as callback] (/root/cypress/packages/web-config/node_modules/neo-async/async.js:8067:18)
[desktop-gui:build  ]     at options.error (/root/cypress/packages/web-config/node_modules/node-sass/lib/index.js:294:32)

[flotwig]

"Proxy Settings" is technically a "Global Setting", at some point, we should move the preferred editor + proxy settings to their own "Global Settings" section that is distinct from project-level settings.

So we don't overly inflate the UI changes from this PR, maybe the "Proxy Settings" should just be moved into the new "Global Settings" section for now?