OrbbecSDK_ROS1 ER1.4.9 "multicam without explicit number of sensors"

Source and binary release with ER modifications:

• image_transport support
• missing install rule for node
• launchfile for FemtoBolt nodelet
  • also exposed hardware timestamps
• don't multiply depth image if scale is 1
• multicamera support doesn't require specifying number of sensors explicitly for each launchfile

---

Note: some of above were already fixed in Orbbec original driver

Cross-checking

• image transport support is added
• orbbec camera node install rule was added
• hardware timestamps are now default

What still seems to be missing is:

• nodelet launchfiles for specific cameras
• multicamera support doesn't require specifying number of sensors explicitly for each launchfile
• don't multiply depth image if scale is 1