This adds the typings for Freedom that we have been using internally
(https://github.com/uProxy/uproxy-lib/tree/dev/third_party/freedom-typings)
There is the main file with all the actual typings and then two extra
files around it that handle the existence of a variable named freedom in
two different environments. The intention is that only one of these
would be included in a given build environment.
I listed myself as the author for this version of the typings. In
reality, they were created by various members of the uProxy team over a
long period of time.
