Fix runaway JurisdictionListener thread and other improvements

* fixed a bug in JurisdictionListener that it wasn't yielding at all... therefore wasting lots of CPU cycles
* improve general thread performance of PacketSender and ReceivedPacketProcessor by switching to use QWaitCondition instead of micro-sleeps

-------------
**Profile BEFORE:**
```
Running Time	Self		Symbol Name
3724.0ms   11.6%	3724.0	 	std::vector<NetworkPacket, std::allocator<NetworkPacket> >::size() const
1595.0ms    4.9%	0.0	 	 ReceivedPacketProcessor::process()
1593.0ms    4.9%	0.0	 	  JurisdictionListener::process()
   2.0ms    0.0%	0.0	 	  GenericThread::threadRoutine()
1127.0ms    3.5%	0.0	 	 PacketSender::nonThreadedProcess()
1127.0ms    3.5%	0.0	 	  PacketSender::process()
1127.0ms    3.5%	0.0	 	   JurisdictionListener::process()
 925.0ms    2.8%	0.0	 	 PacketSender::hasPacketsToSend() const
 925.0ms    2.8%	0.0	 	  JurisdictionListener::process()
  76.0ms    0.2%	0.0	 	 <Unknown Address>
   1.0ms    0.0%	0.0	 	 PacketSender::threadedProcess()
3636.0ms   11.3%	3636.0	 	mach_absolute_time
3135.0ms    9.7%	3135.0	 	__commpage_gettimeofday
2229.0ms    6.9%	2229.0	 	PacketSender::nonThreadedProcess()
1354.0ms    4.2%	1354.0	 	SimpleMovingAverage::updateAverage(float)
546.0ms    1.7%	546.0	 	JurisdictionListener::process()
506.0ms    1.5%	506.0	 	QMutex::lock()
469.0ms    1.4%	469.0	 	GenericThread::isStillRunning() const
467.0ms    1.4%	467.0	 	gettimeofday
440.0ms    1.3%	440.0	 	QMutex::unlock()
391.0ms    1.2%	391.0	 	szone_malloc_should_clear
381.0ms    1.1%	381.0	 	JurisdictionListener::queueJurisdictionRequest()
```

-------------
**Profile AFTER:**
```
Running Time	Self		Symbol Name
820.0ms    6.5%	820.0	 	mach_msg_trap
589.0ms    4.7%	589.0	 	glm::detail::tvec3<float, (glm::precision)0>::tvec3(float const&, float const&, float const&)
532.0ms    4.2%	532.0	 	glm::detail::tvec3<float, (glm::precision)0> glm::detail::operator*<float, (glm::precision)0>(glm::detail::tvec3<float, (glm::precision)0> const&, glm::detail::tvec3<float, (glm::precision)0> const&)
530.0ms    4.2%	530.0	 	glm::detail::tvec3<float, (glm::precision)0>::tvec3(glm::detail::tvec3<float, (glm::precision)0> const&)
405.0ms    3.2%	405.0	 	ViewFrustum::boxInFrustum(AABox const&) const
323.0ms    2.5%	323.0	 	BuckyBalls::simulate(float, HandData const*)
318.0ms    2.5%	318.0	 	Plane::distance(glm::detail::tvec3<float, (glm::precision)0> const&) const
311.0ms    2.4%	311.0	 	glm::detail::compute_dot<glm::detail::tvec3, float, (glm::precision)0>::call(glm::detail::tvec3<float, (glm::precision)0> const&, glm::detail::tvec3<float, (glm::precision)0> const&)
248.0ms    1.9%	248.0	 	glm::detail::tvec3<float, (glm::precision)0>::tvec3(float const&, float const&, float const&)
243.0ms    1.9%	243.0	 	float glm::length<float, (glm::precision)0>(glm::detail::tvec3<float, (glm::precision)0> const&)
229.0ms    1.8%	229.0	 	AABox::getVertexN(glm::detail::tvec3<float, (glm::precision)0> const&) const
200.0ms    1.6%	200.0	 	AABox::getVertexP(glm::detail::tvec3<float, (glm::precision)0> const&) const
197.0ms    1.5%	197.0	 	std::sqrt(float)
165.0ms    1.3%	165.0	 	glm::detail::tvec3<float, (glm::precision)0> glm::detail::operator-<float, (glm::precision)0>(glm::detail::tvec3<float, (glm::precision)0> const&, glm::detail::tvec3<float, (glm::precision)0> const&)
147.0ms    1.1%	147.0	 	glm::detail::tvec3<float, (glm::precision)0>::tvec3(glm::detail::tvec3<float, (glm::precision)0> const&)
142.0ms    1.1%	142.0	 	OctreeElement::getChildAtIndex(int) const
135.0ms    1.0%	135.0	 	float glm::dot<float, (glm::precision)0, glm::detail::tvec3>(glm::detail::tvec3<float, (glm::precision)0> const&, glm::detail::tvec3<float, (glm::precision)0> const)
111.0ms    0.8%	111.0	 	glm::detail::tvec1<float, (glm::precision)0>::tvec1(float const&)
108.0ms    0.8%	108.0	 	glm::detail::tvec3<float, (glm::precision)0> glm::detail::operator*<float, (glm::precision)0>(glm::detail::tvec3<float, (glm::precision)0> const&, float const&)
107.0ms    0.8%	107.0	 	glm::detail::tvec4<float, (glm::precision)0>::tvec4(float const&, float const&, float const&, float const&)
99.0ms    0.7%	99.0	 	numberOfOnes(unsigned char)
```