Allow to configure SCM id and privateKey as Mojo parameter

[kwin]

New feature, improvement proposal

Currently the SCM id can be configured with the undocumented property project.scm.id (

maven-release/maven-release-plugin/src/main/java/org/apache/maven/plugins/release/AbstractScmReleaseMojo.java

Line 171 in c8cd8f0

descriptor.setScmId(project.getProperties().getProperty("project.scm.id"));

). This is used to map a server inside the settings.xml to an SCM repository. In order to make this feature more visible there should be a dedicated Mojo parameter for that. In addition there should be an explicit parameter for the privateKey.