Static Remapping Multi Token Wildcard **

[sloretz]

Feature request

Feature description

Implement multi token wildcard ** for static remapping from command line arguments.
Implementing requires changing rcl_remap_t to store information about wildcards.
It also requires changing the matching logic to allow backtracking.
This is blocked by ros2/design#173

Implementation considerations

Behavior of ** is described in the remapping design doc.