Deploying engine and not recompiling

Also there is one more issue thas has come up. there is a difference when we are compiling a plugin which we are developing that contains our tools when we compile it as a part of a project and when we compile it as part of an engine. Usually when compiling as a part of the engine it has more issues with includes and requieres explicit includes which were not needed when compiling the plugin in project. Not sure what causes it.