SamsaFont constructor should accept other types of input data

[Lorp]

Currently the SamsaFont constructor only accepts a SamsaBuffer containing a TTF. It makes sense to allow it to accept:

• ArrayBuffer containing a TTF
• ArrayBuffer containing a WOFF2-compressed TTF
• SamsaBuffer containing a TTF
• SamsaBuffer containing a WOFF2-compressed TTF

[Lorp]

If the input is WOFF2, we still need to pass Samsa a WOFF2 decoder and a Buffer prototype; and we must inform the caller whether the font was WOFF2. If is was WOFF2, then the caller may wish to discard that memory, or ask Samsa to in the call.