Rename the QmlJSDebugClient lib to QmlDebug (shorter names, easier differentiation with the shared/qmljsdebug lib).

Also rename
 - QDeclarativeDebug* classes to QmlDebug*
 - QDeclarativeOutputParser class to QmlOutputParser

To clarify the features,
 - Debugger::QmlDebuggerClient is now Debugger::BaseQmlDebuggerClient
 - QmlEngineDebugClient is now BaseEngineDebugClient
 - QmlDebuggerClient is now QmlEngineDebugClient
 - QDeclarativeEngineDebugClient is now DeclarativeEngineDebugClient

Change-Id: Ie15713730a614c8ab4b637fad0924f95b54e633f
Reviewed-by: Aurindam Jana <aurindam.jana@nokia.com>