Language changes:
 * Rename generator type 'O' to 'W'.
   [Add backward-compatibility deprecated alias.]

Add more scripts using 'R', reorganize further.
 - Add 'examples/misc3-2pm_R.sau'.
 - Add 'examples/rainy_thunder.sau'.
 - Add 'examples/random-blip_thump.sau'.
 - Add 'examples/sounds/bg-scape-00.sau'.
 - Add 'examples/sounds/bg-scape-00b.sau'.
 - Add 'examples/sounds/bg-scape-01.sau'.
 - Add 'examples/sounds/electro_growls.sau'.
 - Add 'examples/sounds/hearty_rumble.sau'.
 - Add 'examples/sounds/kaboom0.sau'.
 - Add 'examples/sounds/ambient_rumble.sau'.
 - Add 'examples/sounds/music-elem-00.sau'.
 - Add 'examples/sounds/music-elem-01.sau'.
 - Add 'examples/sounds/music-elem-02.sau'.
 - Add 'examples/sounds/small-stove-fire.sau'.
 - Move 'examples/melody*.sau' to 'devtests/'.
 - Rename 'examples/drumlike_repeating.sau'
   to 'examples/repeat-drum-old.sau'.
 - Rename 'examples/sounds/*voicelike.sau',
   to 'examples/sounds/voicelike*.sau'.

Add these scripts to the 'extra-scripts' repo.
 - Add 'examples/random-drumming0.sau'.
 - Add 'examples/random-drumming1.sau'.
 - Add 'examples/random-drumming2.sau'.

Later sync up fully with 2023-01 "mgensys" scripts.
 * Old branch:
    - 2022-12-03: Add first 'R' example scripts...
    - 2022-12-06: Begin adding some new scripts...
    - 2022-12-08: Various scripts done or changed.
    - 2022-12-16: 'examples/sounds/bg-test-01.mgs'
    - 2022-12-17: 'examples/sounds/bg-calm-00.mgs'
    - 2023-01-02: 'examples/sounds/bg-test-03.mgs'
    - 2023-01-04: Add, update scripts for 'R' 'm'.
    - 2023-01-14: Add, update scripts for 'm' 'g'.