Reduce default static_input_buffer_size.

There seems to be diminishing returns after 32 bytes, and it takes
significantly less space. (It's only a default, anyway.)
Change from BSD-3 License to ISC License.

The "Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution."
clause of the BSD license seems to be problematic manufacturers that
do not otherwise provide written documentation for hardware.