rtabmap_util tests and doc (#1450)

* Initial tests

* more tests

* More in-depth deskew() testing

* slightly less verbose clamping corruption warning

* added tf buffer related tests

* added remaining tests

* Added rosdoc2, improve tests when we require sync of odom stamp and sensor stamp

* cleanup doc

* fixing ci

* rtabmap_util tests and doc

* Added db_player tests

* Added MapsManager tests

* Added map_assembler tests

* Documenting node first draft

* relative links

* Fixed british->usa english style. Reviewed all md files.

* added link to install ros1

* updated badges

* added Iron

* added ubuntu

* added codecov

* updated coverage ci

* fixing rosdep

* updated ci cov job

* ci bump

* fixing cov ci

* small doc cleanup

rtabmap_util/package.xml

@@ -36,7 +36,10 @@
   <depend>rtabmap_sync</depend>
   <depend>grid_map_ros</depend>
 
+  <test_depend>ament_cmake_gtest</test_depend>
+
   <export>
 	<build_type>ament_cmake</build_type>
+	<rosdoc2>rosdoc2.yaml</rosdoc2>
   </export>
 </package>