Static remapping with single token wildcard, url schemes, and backreferences

[sloretz]

WIP static remapping with wildcards, url scheme, and backreferences. I'm creating this PR to have a place to copy/paste CI results.

Done

• Lexer
• Lookahead (2) buffer on top of lexer

Todo

• Parser
• Update contents of rcl_remap_t
• Update name matching logic
• Update name replacement logic

Connects to ros2/ros2#450

[sloretz]

(windows)

[sloretz]

Closing. I'm splitting the features (again). #227 does URL scheme, a PR after that will add single-token wildcard and backreferences, and a PR after that will add multi-token wild cards.