This results in much smaller and more efficient machine code.

It should not affect correctness, either: Indeed, the delay value
is computed from dividing an int by another int, so it fits into an int.
The delayTolerance is a fraction of that int, so it also fits.
Intermediate results like delay * pro.zero.high are ints because they
are equal to
 timings[0] * pro.zero.high / pro.syncFactor.low
but syncfactor.low is always larger (at least in all current protocols)
than any other high/low value.

Also get rid of the dummy protocol (which was only there to
make the proto array indices match the protocol numbers.
Now they are off by one, but this saves 8 bytes of valuable storage.

The resulting code is actually simpler, and more powerful at the
same time

This clarifies the code. It also reduces the code size
by another 1000 bytes or so.

This reduces the code size by about 500 bytes (e.g. TypeD_REV example
for me went from 5242 to 4738 bytes, a saving of about 10%)

* move the PROTOCOL3_ #defines from .h to .c and turn them into enums
  (debugging enums is easier than #defines)
* add sync factor constants for protocols 1 and 2
* use the PROTOCOL* constants in more places

Fixes some typos, and wraps it for readability

These help to catch bugs, and also can sometimes help the compiler
optimize the code

Added support for compiling rc-switch for Raspberry Pi (wiringPi library), this is used from the 433Utils project

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- receive without callback now

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