[MSHADE-307] defaults for transformers and filters

[rmannibucau]

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[eolivelli]

What about adding some description about new default in this page ? https://maven.apache.org/plugins/maven-shade-plugin/examples/resource-transformers.html

[eolivelli]

@rfscholte please take a look

[eolivelli]

@rmannibucau tests are failing on Jenkins https://builds.apache.org/job/maven-box/job/maven-shade-plugin/job/MSHADE-307/1/

[rmannibucau]

Another path separator issue :(, fixed hopefully

[eolivelli]

good https://builds.apache.org/job/maven-box/job/maven-shade-plugin/job/MSHADE-307/2/

[rmannibucau]

Updated the PR, I think the test is more relevant for this particular case than an IT since we don't care how it runs but we care about what it runs, let me know if it is still an issue.

[rmannibucau]

Can depend on the SPI PR, could be replaced by a SPI module IMHO.