Moved citrus-*.xsd schemas into their own maven modules.

 This was necessary to allow the admin gui to reference the XSDs whilst avoiding having to create a dependency to citrus-core (and other mvn modules) from the admin-gui.
Moved citrus-*.xsd schemas into their own maven modules.

 This was necessary to allow the admin gui to reference the XSDs whilst avoiding having to create a dependency to citrus-core (and other mvn modules) from the admin-gui.