Replace gts with eslint

[dilin-MS]

Replace gts with eslint and prettier.

Leave out views/ vendor/node-usb-native and assets/ folder since javascript files in these folder cause too many eslint error.
Delaying linting these files for the below three reasons:

1. There are tons of eslint error in these files. Fixing them requires much work.
2. Since changes are so many, it requires careful test. Or it will be error-prone.
3. This part of code is relatively infrequently modified.

We can discuss later whether take time to fix eslint errors in these folders.