Use Windows Registry Paths to better determine the location of Steam Library

[JMTK]

Problem

Some users put their steam libraries in custom locations, even aside from other drives.

Solution

32-bit: HKEY_LOCAL_MACHINE\SOFTWARE\Valve\Steam
64-bit: HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Valve\Steam

and their InstallPath property for more reliable steam path detection and then use that as a base dir. also means you dont need to do weird crawling of all drives for steam with predefined paths that dont work for everyone

Thanks to BigBrainAFK#0001 for the suggestion!