Update tycho.version to v1.7.0

This MR contains the following updates:

Package	Update	Change
org.eclipse.tycho:tycho-p2-plugin	minor	1.2.0 -> 1.7.0
org.eclipse.tycho.extras:tycho-buildtimestamp-jgit	minor	1.2.0 -> 1.7.0
org.eclipse.tycho:tycho-packaging-plugin	minor	1.2.0 -> 1.7.0
org.eclipse.tycho.extras:tycho-source-feature-plugin	minor	1.2.0 -> 1.7.0
org.eclipse.tycho:tycho-source-plugin	minor	1.2.0 -> 1.7.0
org.eclipse.tycho:target-platform-configuration	minor	1.2.0 -> 1.7.0
org.eclipse.tycho:tycho-maven-plugin	minor	1.2.0 -> 1.7.0

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