nsis-plugin should not depend on dist props, should support deploy and install

Currently the maven-nsis-plugin uses some properties of the maven-dist-plugin to determine where its input should be taken from and where its the output (the installer) should be stored.
I would instead suggest to establish independent properties, for example maven.nsis.build.dir and maven.nsis.final.name.
Additionally, the usual -deploy, -deploy-snapshot, -install, and -install-snapshot goals should be added. These goals should store the installer produced from nsis in the local or remote repository.