Many configuration files in this repository were created a long time
ago, then were modified as problems occurred. Now that there is
TypeScript support, it makes sense to clean up this mess, at least by
making small steps. This configuration is based on strict settings, but
most of these are currently disabled - otherwise it would be too hard to
work with existing JavaScript code. The downside of this change is
pollution of files with warnings and errors, even though they are valid.
- ESLint/TypeScript upgraded
- TS configuration is now shared between arbitrary Node scripts, Gulp
files and the Electron wrapper
- A few eslint-disable comments are removed
