Include more hidden files in projectfilter plugin (CI, Lint configs...)
Motivated by 58e6d4c60142 this commit adds a few more standard files to
include in the project filter by default:
- gitlab, travis, circleCI CI config
- pre-commit commit hooks config
- pep8 (Python), prettier (JS, CSS, HTML formatter, see Prettier.io) linter/formatter configs
- .editorconfig file