Project Generator submodule / install from GitHub process

[artificiel]

The instructions to install from GitHub make a half-hearted attempt at people compile their own PG through the submodule, while acknowledging it's not a good idea:

As the first option can lead to unexpected results, we suggest you use the second approach.

that's kind of noisy and not very elegant...

the PG is compiled in a nightly process, and someone tracking git will be interested in the latest PG anyway, which can be obtained for the main platforms: https://github.com/openframeworks/projectGenerator/releases/tag/nightly and someone wanting to compile PG can go to it as a separate project.

so i propose to remove the instructions to try to compile and simply point to the nightlies PG binaries. this focuses the problems of compiling PG in the Project Generator GitHub README.

[dimitre]

@ofTheo if we just remove projectGenerator submodule, will it break anything in the build process?
I think it will only have effect on this instructions: https://github.com/openframeworks/openFrameworks/blob/master/INSTALL_FROM_GITHUB.md

[danoli3]

Yeah totally the build process was confusing for the PG

We fixed should be much easier to setup env and build projectGenerator - apps\projectGenerator\scripts
setup_environment.sh
build_cmdline.sh
build_frontend.sh

currently these scripts setup for VS/macOS