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Resolve "Enable Maven Build"

Closes #5

See merge request !3

* Add Maven parent with tycho and P2 repo(s) for target definition
* Add Maven nature to all projects
* Add POM files with packaging eclipse-plugin , -feature, -repository
* Dedicated project for product definition
* Add configuration with default start levels to product definition

Resolve "Add application plugin"

Closes #4

See merge request !2