Add ETG scripts for these modules?

[RobinD42]

Some of these were in Classic but seldom used. Some are new.

• msgout
• quantize
• docmdi ???
• docview ???
• persist ???

[carandraug]

For what is worth, someone on IRC was just asking about Quantize:

ErkiS wrote on IRC:

so I'm trying to save a wx.Image as GIF. the docs at https://docs.wxpython.org/wx.Image.html say I should use Quantize to reduce the color space to 8bit. but there is no such thing as Quantize in wxpython..
is this a bug in the docs or in the code? class Quantize does exist in wxwidgets.