Add new Libretro core manager module (#249)

* Add initial external configuration files support.

These external configuration files allow changing app params at the runtime without recompilation.

* Find config files with specified directory in the tests

* Add aspect ratio recalculation config

* Clean code

* Add new configuration files into the Docker container image

* Add shared core and config paths into the Libretro cores config

* Split ROM <-> Emulator mapping between workers and coordinators

* Extract coordinator config

* Add shared worker/coordinator server config

* Add explicit embedded shared worker/coordinator struct for auto-config reflection fill

* Remove default stun/turn servers from the config

* Extract and add new ice servers config structures

* Update coordinator config params

* Add auto emulation lib loader based on the runtime OS/arch

* Update configuration structures

* Remove shared config embedding

* Add missing network config params

* Add game library external config

* Remove unused config parameters

* Add WebRTC encoder external options

* Add user dir for config search

* Update config loader

* Update config

* Add generic downloader with Grab lib implementation

* Add a simple file downloader backed by the grab lib

* Add initial Libretro core repos abstractions

* Expose compression info for Libretro cores repository records

* Add pipe-based abstract file downloader

* Refactor downloader

* Refactor Libretro repos

* Add worker coresync stubs

* Add multiprocess-safe HTTP-based core manager implementation

* Remove Libretro cores from the repo

* Keep custom N64 cores in te repo for now

* Add Libretro cores repo select in the config

* Fix http manager repo switch

* Cleanup code

* Add greedy Libretro lib loader

* Don't crash when arch map is not set

* Disable dynamic recompiler for pcsx core by default since it's could cause a crash

* Use global Libretro dynalib handler

* Shorten the default Libretro cores store path

* Update zip extractor implementation

* Remove explicit fig lib field markings

* Add config note to the README file

* Add GitHub repo backend for the core downloader

* Fix GitHub repo param list in the manager factory

* Add env variables reader with CLOUD_GAME prefix

* Re-optimize ice server info struct custom marshaler

.github/workflows/build.yml

@@ -72,7 +72,7 @@ jobs:
           ./mesa/systemwidedeploy.cmd < ./commands
 
           wget -q https://buildbot.libretro.com/nightly/windows/x86_64/latest/mupen64plus_next_libretro.dll.zip
-          "/c/Program Files/7-Zip/7z.exe" x mupen64plus_next_libretro.dll.zip -oassets/emulator/libretro/cores
+          "/c/Program Files/7-Zip/7z.exe" x mupen64plus_next_libretro.dll.zip -oassets/cores
 
           make build