periodics.pde	Periodically do multiple independent tasks.

This is a very early experimental test version
adapted to experiment witch timer overflow strategies.
periodics.pde	no special 'NOW' keyword nneeded for setup_task().
periodics.pde	nice 3 to 5 click pattern with phase offset.
periodics.pde	working towards playing with rhythm patterns.
periodics.pde	source code formatting.
periodics.pde	Merge branch 'master' into play
periodics.pde	Imported serial menu basics.
periodics.pde	new function set_new_period().
periodics.pde	merge branch 'master' into play.
periodics.pde	menu factoring, play extensions.
periodics.pde	COUNTED tasks doing it int1[task] times, then vanish.

New COUNTED flag.
Factored out init_task(task) to kill counted tasks when done.
New unsigned int task variable int1[task], for internal use, mainly.
'int1' stands for both, internal and int.
setup_task() takes it as 5th parameter.

Other changes:
Added CUSTOM_1 CUSTOM_2 CUSTOM_3 flags that can be used by periodic_do().
Added new int task variable parameter_1[task], can be used by periodic_do().
periodics.pde	COUNTED tasks doing it int1[task] times, then vanish.

New COUNTED flag.
Factored out init_task(task) to kill counted tasks when done.
New unsigned int task variable int1[task], for internal use, mainly.
'int1' stands for both, internal and int.
setup_task() takes it as 5th parameter.

Other changes:
Added CUSTOM_1 CUSTOM_2 CUSTOM_3 flags that can be used by periodic_do().
Added new int task variable parameter_1[task], can be used by periodic_do().
periodics.pde	merge branch 'master' into play.
periodics.pde	selecting and switching click periodics in the menu.

Periodics are on '0' '1' '2' '3' instead of 'A' 'B' 'C' 'D' now.
Switching with 's' toggles them.
periodics.pde	time units in the menu.
periodics.pde	new flag DO_NOT_DELETE.
periodics.pde	merge branch 'basics'
periodics.pde	merge branch 'master' into play.
periodics.pde	merge branch 'basics'.
periodics.pde	extended menu functionality.

New destinations for ALL_PERIODICS and TIME_UNIT 's' '*' '/' '='.
Much improved informational feedback.