xcyl(), ycyl(), zcyl() pass through all parameters to cyl()

[amatulic]

Changes to xcyl(), ycyl(), and zcyl() in shapes3d.scad:

• Now xcyl(), ycyl(), and zcyl() can have textures like cyl(). All three modules now take all the same arguments as cyl() except for orient.
• For compatibility with how these modules worked previously, orient is used to orient the cylinder.
• All three modules now have function counterparts, like cyl().
• Documentation shortened, now explains that these are alias shortcuts for cyl() and refers the reader to the cyl() documentation for usage.

The cuboid() module calls xcyl(), ycyl(), and zcyl(). Tested all examples in cuboid() as well as the original examples in xcyl(), ycyl(), and zcyl().

[amatulic]

All pass-through arguments are now named, for robustness in case the arg list for cyl() ever changes.

Also, the original function version of cyl() had width and height in two different places in the argument list. Fixed.

Re-tested examples in cuboid(), xcyl(), ycycl(), and zcyl(), as well as examples in cyl().