QmlDebugging: Add v4DebugService

Initial checkin

Change-Id: Id38166bcc4a63e0543033d25515a135ad492ee2e
Reviewed-by: Kai Koehne <kai.koehne@digia.com>
QmlDebugging: Replace QV8DebugService with QV4DebugService

Change-Id: Ic8c99e3984d9ef6d122f7d8834df97eeb1f1fda3
Reviewed-by: Kai Koehne <kai.koehne@digia.com>
QmlDebugging: Process commands in v4DebugService

Change-Id: I6371db756f72ee373884268fc49a5b16cb66fd34
Reviewed-by: Kai Koehne <kai.koehne@digia.com>
qmlplugindump: adding verbose output for the instantiation operations

Change-Id: Ic18d85de92f05c01b6ce00b071ef9b94d878434f
Reviewed-by: Caroline Chao <caroline.chao@digia.com>