Add snippets project to automated build #1390
Description
The snippets project org.eclipse.swt.snippets is currently not part of the Tycho build. The reasons for this are the necessity to set up the projects with a proper OS-specific classpath configuration depending on the build environment and to consider OS-specific classpath exclusions.
In #1347 (comment), several issues for JDT and Tycho related to the problem have been shared. This includes features that avoid copying around OS-specific .classpath files.
As a simpler and faster-to-achieve solution, I propose to start with using a Maven plugin to copy the classpath file according to the current build environment. What will still be required to make this work is support for classpath exclusions in Tycho, as otherwise OS-specific snippets are tried to be compiled: