Update tycho.version to v3 (major)

This MR contains the following updates:

Package	Type	Update	Change
org.eclipse.tycho:tycho-p2-plugin (source)	build	major	2.7.5 -> 3.0.0
org.eclipse.tycho:tycho-packaging-plugin (source)	build	major	2.7.5 -> 3.0.0
org.eclipse.tycho:tycho-source-plugin (source)	build	major	2.7.5 -> 3.0.0
org.eclipse.tycho:target-platform-configuration (source)	build	major	2.7.5 -> 3.0.0
org.eclipse.tycho:tycho-maven-plugin (source)	build	major	2.7.5 -> 3.0.0

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