Added maven pom.xml files.
Update gitignore
Update gitignores
Remove unused launch configs.
Fixes for two-stage build and cleanup.
Add missing dependencies
Convert to Maven projects and sync version to 1.2.0.qualifier.
Add project metadata to POM files, required for publishing to the Maven central repository.
Change package name from nul to nulll, because a folder named 'nul' cannot be created on Windows (http://superuser.com/a/613335), and 'null' is a Java keyword.
Bump version to 1.3.0-SNAPSHOT
Merge branch 'spoofax' into spoofax-release