Detanup01/gbe_fork release-2026_04

What's Changed

Update old interface function signatures by @NicknineTheEagle in #479
SteamGameServer_Init old version, callback fix by @NicknineTheEagle in #481
Fixes for Source query handler by @NicknineTheEagle in #488
Fail if SteamAPI_ManualDispatch_FreeLastCallback() is not called before SteamAPI_ManualDispatch_GetNextCallback() by @universal963 in #491
Update pipe index handling + fix interface generator by @NicknineTheEagle in #493
Fix SteamNetworkingSockets lane propagation and SendMessages path by @Rustbeard86 in #495

Full Changelog: release-2026_03_28...release-2026_04_25