Default `BABASHKA_TEST_ENV` to `jvm` for libtests
CI already understands this need, but defaulting in-script avoids
having devs to understand/remember it too.
Alter PATH as required for new babashka.process tests.
In support of babashka/process#163, babashka/process#164
- add lib-tests path to deps.edn and remove it from shell scripts
- change windows lib test batch script to write a bb.edn file
- re-enable native lib tests on windows
* run lib tests in Windows CI
- add batch scripts for invoking tests
- skip some tests on windows
- tweak a couple tests to run on linux and windows
* configure git to checkout with Windows line endings on Appveyor
