QML Debugger sends initial breakpoints after CONNECT

The QML engine on the server side is blocked until the CONNECT message is received. We are supposed to use this fact for setting breakpoints that may be hit early in the execution. Therefore, all initially known breakpoints should be set before sending CONNECT. The way it is now, we have a race condition between setting and hitting the breakpoints, and breakpoints on, for example, anchors are somewhat hit and miss.