Change the default max depth to more than 4.5m

[ofTheo]

DepthPacketProcessor::Config::Config() :
  MinDepth(0.5f),
  MaxDepth(4.5f),
  EnableBilateralFilter(true),
  EnableEdgeAwareFilter(true)
{

I think this can be set via the config in ofProtonect.

[ofTheo]

closed by #37