Example for anim12 written in Batch script

[Squadzone]

for Windows execute with command prompt tested with gmt 6.1.1

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[seisman]

@joa-quim I guess we don't want to maintain batch scripts for our animation examples, right?

[joa-quim]

Agree that we don't want to maintain (worst, create versions of) animations batch scripts but I think it would be good to have at least one example to show that Windows users can also write their animations with plain .bat files.

[seisman]

I think it would be good to have at least one example to show that Windows users can also write their animations with plain .bat files.

https://docs.generic-mapping-tools.org/dev/movie.html

Is this one enough?

[joa-quim]

Well, yes but it wouldn't harm either if we had one of the animations as a batch file. And specially in this case that the user already made it.

[seisman]

I guess we need a Windows user to run the batch scripts to make sure they're correct.

[seisman]

Actually, the batch version is more difficult to read and understand, because it uses echo extensively to write GMT commands into the pre, main and post scripts.

[seisman]

I'm closing this PR.