Added exponential distribution, continuous range

Changed algorithm so it will work with continuous range.  Now using
“random big number” / big number scaled into output range.  Added inlet
for choosing the distribution.  Default is linear, and weight is
expressed as a power of 2.  (0=lin, -1 = log, 1 = exp)
Phasor follows hard sync

Now it resets with the other wave forms too.  (except for cycle~, which
doesn’t have hard sync.  Should this follow cycle~ instead?)
Timing adjustments, constant power pan

Using $1 0 $2 $3 instead of $1, $2 $3 to get more consistent timing out
of line~.  (with the comma, they’re separated into two distinct
messages so depending on what’s happening at control rate, there may be
some lag)