adjusting for windows.

[alensiljak]

Python 3.6
The only (known) item left to solve is how to check for required libs in toolchain.py.

This solves #1232 and #1234.
p4a runs and shows the argument info.

Requires further testing.

[alensiljak]

Now I'm getting [WARNING]: Asked to compile for no Archs, so failing. when calling

p4a apk --private ../. --package=org.example.myapp --name "My WebView Application" --version 0.1 --bootstrap=webview --requirements=flask --port=5000 --arch=armeabi-v7a 

[inclement]

Instead of copying the sh import error catching everywhere, I think it would be methodologically better to put it in one place (a new p4a file) and then every other file can import it from there.

That said, I don't think there's much point in doing this unless p4a is changed to actually work on windows, doing something like #994 (filling in all the gaps so it actually works, polishing it, and supporting it post-merge). Barring that, I think it would be better to detect the windows environment and exit with an error message before even trying the imports.

Thanks for the PR, but for these reasons I won't merge these changes.

[alensiljak]

Thanks for the feedback. Having that clearly stated somewhere in the ReadMe would have saved me (and perhaps others) significant time and effort which could have been contributed to other projects.

I will try to work off #994 and see if something can be done.
Having a Flask application with a WebView client would be a great option for a multiplatform app.