Pytest-inline

- Change: Remove unused code
- Change: Capture a general Exception (not limited to ImportError and ModuleNotFoundError) when attempting to import modules during collection phase

- Change: Update README

Changed
- Change: Use `itest` instead of `Here` for inline test constructor

Fix
- Fix: inlinetest-only skips collecting inline tests

Added
- Add badges in README

Added
- New README

Added

- JUnit 5 features: timeout, more types of assertions, assumptions, and running tests in order
- Option "inlinetest-only"
- Integration tests of running tests in parallel with pytest-xdist