VINS-Fusion-GPU version's No ROS version

Check other branch, ROS removing is done.

VINS-Fusion : from here

VINS-Fusion-GPU : from here

No-ROS version

0. camera_models : merged into one header, one source file

• Original package is not dependent on ROS, using original one would be fine.

1. Merged all header files into one.

2. Merged all src files into one + main.

3. Trying to remove ROS. ==> branch here

• CameraPoseVisualization got removed
• some Publishing functions got removed
• using ros_things.h
• need data set from EuRoc here as ASL data format