Proposal: Remove oss-parent parent

[philipwhiuk]

The Maven project currently relies on oss-parent 7:

    <parent>
        <groupId>org.sonatype.oss</groupId>
        <artifactId>oss-parent</artifactId>
        <version>7</version>
    </parent>

But:

1. oss-parent 7 pulls in maven-enforcer-plugin 1.0 which is both highly outdated and dependent on a library with known CVEs
2. The entire oss-parent project is "no longer active or supported"

I'm not sure what the benefit is at this point. It seems to build fine with this not set.