Create a sample tool that download the assets from the asset repository

[tdecroyere]

Create a sample tool that download the assets from the asset repository with a corresponding tag and launch the compilation of everything.

The assets will download the zip file from GitHub with a certain fixed commit hash or tag and will put the assets in the root folder of the bin directory.

It will then invoke the different tools for each type of assets.
The tool will not compile shaders. The shaders are part of the normal build process and are part of the source code.

Each compiled asset needs to be put in the correct resource folder?
It would be cool if we could run the download