Add support for 'H' packets to change thread.

	* src/GdbServer.cpp (GdbServer::rspServer): Correct capitalization
	of getBreakCommand.
	(GdbServer::rspClientRequest): Provide handler for 'H' packets
	(GdbServer::rspSetThread): Created.
	* src/e-server/src/GdbServer.h: Add rspSetThread.
	* src/e-server/src/RspConnection.cpp
	(RspConnection::getBreakCommand): Use gotChar, not n in return.
	* src/e-server/src/TargetControl.h: Add SetThreadIdGeneral and
	SetThreadIdExecute as pure virtual methods.
	* src/e-server/src/TargetControlHardware.cpp
	(TargetControlHardware::TargetControlHardware): Initialize
	threadIdGeneral and threadIdExecute.
	(TargetControlHardware::setThreadGeneral): Created.
	(TargetControlHardware::setThreadExecute): Created.
	* src/e-server/src/TargetControlHardware.h: Add declarations of
	setThreadGeneral, setThreadExecute, threadIdGeneral and
	threadIdExecute.