This adds support for Windows.
The in-language path separator is still `/`, to ensure Pkl programs are cross-platform.
Log lines are written using CRLF endings on Windows.
Modules that are combined with `--module-output-separator` uses LF endings to ensure
consistent rendering across platforms.
`jpkl` does not work on Windows as a direct executable.
However, it can work with `java -jar jpkl`.
Additional details:
* Adjust git settings for Windows
* Add native executable for pkl cli
* Add jdk17 windows Gradle check in CI
* Adjust CI test reports to be staged within Gradle rather than by shell script.
* Fix: encode more characters that are not safe Windows paths
* Skip running tests involving symbolic links on Windows (these require administrator privileges to run).
* Introduce custom implementation of `IoUtils.relativize`
* Allow Gradle to initialize ExecutableJar `Property` values
* Add Gradle flag to enable remote JVM debugging
Co-authored-by: Philip K.F. Hölzenspies <holzensp@gmail.com>
