Create "GLIP URL" syntax to specify backend + options as one string

[imphil]

Currently, users must pass a backend (e.g. tcp, uart, etc.) and a set of key=value pairs to GLIP to be used as options. An easier syntax for users would be a URL which contains all parameters, e.g.
glip://uart?speed=12000000&device=/dev/ttyUSB0 or glip://tcp?host=localhost&port=23000

TODO:

• Figure out a reasonable format.
• Implement a parsing function inside glip