This adds the familiar autotools build system and associated documentation
for Linux, FreeBSD, Mac, MinGW, and Cygwin. The old Makefiles have been
kept, and where appropriate have been renamed Makefile-manual.
Thanks to Peter Stuge, Ludovic Rousseau, Xiaofan Chen, Alex Dupre, and
Segher Boessenkool for providing testing, review, and suggestions, and to
Ludovic Rousseau for providing patches which contributed to this commit.
Carbon is no good on 10.5 and later on 64-bit. Github user
dportabella found a workaround in Cocoa[1], and I added code
to make it handle the events from the dock, like the carbon
version did.
[1] https://github.com/signal11/hidapi/issues/14