- Replace uses of deprecated Bourbon helpers with raw CSS
- Add autoprefixer into the build chain to prefix the now removed helpers
This process was achieved by running through each of the deprecation warnings and using the following bash function to replace it in all files:
```
function bourbon-deprecate() {
grep -rl "@include $1" ./frontend --exclude-dir=.git | xargs sed -i '' -E "s/@include $1[(](.*)[)]/$1: \1/g"
}
```
For some helpers, this did not result in valid CSS, so manual modifications were made.
Closes#1189#1274
* Updates eslint packages
* Expected parentheses around arrow function argument having a body with curly braces
* Prop type `object` is forbidden
* Visible, non-interactive elements should not have mouse or keyboard event listeners
* Prop type is defined but not used
* Unexpected use of file extension "jsx"
* Expected 'this' to be used by class method
* HTML entities must be escaped
* Prevent default behavior on more options button click
