AM_GEO_COLOR sets the default color of added geometry.
---->(AM_GEO_COLOR)-----|GET_RGB_COLOR_SA|----->
This command automatically calls up the GET_RGB_COLOR_SA subaction.
Use this subaction to specify the new RGB or HSL color.
Use this action to change the default color of geometry. All
subsequently added geometry will use this color.
GET_RGB_COLOR_SA subaction,
AM_GEO_LTYPE terminate action,
AM_GEO_MODIFY terminate action