RetroArch setup

1. make sure you have RA >= v1.8.5 or a build made after this PR.

2. enable network commands in the RetroArch menu or change the following line in retroarch.cfg:

   network_cmd_enable = "true"

3. start Retroarch and load a supported game in the datfile

4. download this zip file and extract it in some path (e.g. "$HOME/console_hiscore")

5. make sure Python 3 is installed in you system

6. launch tools/retroarch_hiscore_companion.bat (on Windows) or tools/retroarch_hiscore_companion.sh (on linux) and check the console output for error messages. If it says DEBUG:root:found hiscore patches everything is working fine.

Hiscore files (*.hi) are saved and loaded in the savefile_directory by default.