Fix Piton urls and typo

Author: Wartori54

.gitmodules

@@ -6,7 +6,7 @@
 	url = https://github.com/libsdl-org/SDL/
 [submodule "Piton"]
 	path = source/Piton
-	url = https://github.com/EverestAPI/Piton
+	url = https://github.com/Popax21/Piton
 [submodule "source/MoltenVK"]
 	path = source/MoltenVK
 	url = https://github.com/KhronosGroup/MoltenVK

README.md

@@ -14,12 +14,12 @@ These libraries are open source and are built in CI.
 - Theorafile [48d74af](https://github.com/FNA-XNA/Theorafile/tree/48d74afcbf838fe95ca56cec142efae07bb56f65)
 - MoltenVK `1.2.11`
 - Vulkan Loader `1.3.296`
-- Piton [21c7868](https://github.com/EverestAPI/Piton/tree/21c7868d06007f0c5e7d9030a0109fe892df1bf3)
+- Piton [21c7868](https://github.com/Popax21/Piton/tree/21c7868d06007f0c5e7d9030a0109fe892df1bf3)
 
 ### Closed-Source Libraries
 These libraries are closed source and cannot be _built_ in CI.  
 Some are not accessible without an account, and therefore need to be vendored as a binary blob.
 
 - DiscordGameSDK `3.2.1` (downloaded: https://dl-game-sdk.discordapp.net/3.2.1/discord_game_sdk.zip)
 - FMOD Engine `1.10.14` (vendored: [Download (Requires account)](https://www.fmod.com/download#fmodengine), [License](https://github.com/EverestAPI/Everest-libs/blob/main/binaries/fmod/EULA-FMOD.txt))
-- Steamworks SDK `1.40` (with Steamworks.NET `10.0.0`) (vendored: [Download (Offical, Requires account)](https://partner.steamgames.com/downloads/list), [Download (via Steamworks.NET)](https://github.com/rlabrecque/Steamworks.NET/releases/tag/10.0.0))
+- Steamworks SDK `1.40` (with Steamworks.NET `10.0.0`) (vendored: [Download (Official, Requires account)](https://partner.steamgames.com/downloads/list), [Download (via Steamworks.NET)](https://github.com/rlabrecque/Steamworks.NET/releases/tag/10.0.0))