Refactor - All models classes xxxType renamed to xxxDefinition

From James

As an aside I wonder if one of these days we should refactor
org.apache.camel.model.*Type to be *Definition as thats kinda what
they are - the logical, design type definition of routes. For example
the SplitterDefintion just defines how to create a Splitter, its not
a Splitter (the Processor in the processor package).