Improve compatibility with Spring IDE

currently, we have a conflicting content-type which leads to several glitch (even if some of them are fixed with FUSETOOLS-2117 )

last one known: if importing a project, the camel spring file will open by default with Spring editor and not Camel one.

The solution that I can imagine is to provide 2 camel content-types, one extending the Spring beans content type and one for blueprint and java.