OG Core

For mod makers (Graves OG and Sort OG use it from their next versions on). Nothing changes in game.

• OgClient.key(...): adds a key to the Controls screen on every loader and version.
• OgClient.screenInit(...) and OgClient.screenKey(...): add widgets to screens and react to a key pressed on an open screen, after recipe viewers' search boxes had their say (the Forge quirks between 1.20.6 and 1.21.10 included).
• OgClient.blockEntityRenderer(...) and OgClient.cutout(...): register a block entity renderer and a block's cut-out layer at the right moment on each loader.
• A mod's client part now needs no client entry point per loader at all.