Add initial parser implementation.
This is an initial implementation of a parser for the WOFF2 font
It is incomplete; further work will come later. The scope for this
milestone was to be able to parse .woff2 files for the needs of the
At this time, the API is very low level and maps directly to the binary
format of the file, as described in its specification. This API is in
early development and is expected to change as further progress is made.
It successfully parses some Go font family .woff2 files that were
generated using the https://github.com/google/woff2 encoder
from the Go font source .ttf files located at
Add basic test coverage.
For convenience, a godoc view of this change can be seen here.