command line option to select shared and or path to custom shader

[naatje80]

Because I'm backing up my games (hard copies or GOG purchases) with a manually compiled version of scummvm (only with the dependencies and required features for the specific game), the command line options are very useful for the startup script. However, I'm still missing a command line option to select one of the shaders and/or a way to provide a path a specific shader file.

I was already taking a look at adding this option myself and send a pull request. I found that the command line options are managed in: base/commandLine.cpp, but I need more time to find out which internal value I need to change or set. Possible someone could point me in the right direction of which internal value or setting needs to be updated. If this could be easily fixed by one of the main contributors, that would also be great. But I can image that this would have less priority.

[naatje80]

I was able to implement this feature, which has been accepted yesterday in commit 6829281.