Added ubuntu20.04 / ROS noetic support

[MRo47]

Hi

Great job with this project and thank you.

I had some issues compiling it with Ubuntu 20.04 mostly due to the updates in libmrpt_dev v1:2.4.0, eigen3 and mrpt_bridge.

Did a PR yesterday with mrpt_bridge and it now compiles with Ubuntu 20.04.

for libmrpt changed the include paths and namespaces to reflect the new changes.
for eigen3 changed the matrix multiplication functions.

compiles and runs fine on hardware. Haven't done extensive testing though.

[MRo47]

MRPT install was done with

sudo add-apt-repository ppa:joseluisblancoc/mrpt-stable
sudo apt-get update
sudo apt-get install libmrpt-dev mrpt-apps

[Lenny-Lee-ustb]

Thanks! It works in noetic!