[Feature]: Dynamically get dota2 folder when installing the service

[KKire]

Is your feature request related to a problem? Please describe the problem.

If you have changed the default foler of dota 2, it fails to find it because it searches for the default dota 2 beta folder when trying to create the gamestate_integration_rpc.cfg file

Describe the solution you'd like

It would be ideal if the app gets the folder from the steamapps\appmanifest_570.acf file from the installdir value so it properly gets the game folder.

[andsfonseca]

I didn't know it was possible to change the "dota 2 beta" folder path.
I'll try checking the appmanifest_570.acf after reading the library folder in libraryfolders.vdf.

I'm not able to work as much as I want on this project, but I'll try to put this feature in the next update!