[Nice2Have] Automated .config generation for .net version overrides

Have just successfully played Antichamber (requires .NET 3.5) with only .NET 4.0 installed in a 32-bit wine prefix. For this to happen, I followed instructions here on how to override required NET version using .config files.

Note that 3.5 is kind of slow to setup using winetricks because of deps and produces lots of bugs as well. Also I wasn't able to have 3.5 and 4.0 in the same 32 bit prefix. When I tried 40 then 35, 35 produced a "missing fusion" error. And if i try 35 then 40, 40 setup was just locking itself up endlessly with its own threads.

So I thought it would be nice if winetricks could autogenerate such configs for every exe in the directory and subdirectories so that you don't really need 3.5 in most cases.

They can even be temporary, runtime-only files.

It's not clear what configs should be created, given that one is needed for each target exe. In addition, more applications could be installed after winetricks installs dotnet..