Moved the valueditors plugin to tycho

git-svn-id: https://svn.apache.org/repos/asf/directory/studio/branches/studio-tycho@1628929 13f79535-47bb-0310-9956-ffa450edef68
Added the valueeditors plugin in the liust of supported tycho plugins

git-svn-id: https://svn.apache.org/repos/asf/directory/studio/branches/studio-tycho@1628930 13f79535-47bb-0310-9956-ffa450edef68
Added the aciitemeditor plugin to the Tycho build

git-svn-id: https://svn.apache.org/repos/asf/directory/studio/branches/studio-tycho@1628931 13f79535-47bb-0310-9956-ffa450edef68