Walk a Generation 1 routine's ret back into its caller and run Oak's Lab whole

[Decryptu]

Added

• Oak's Lab runs from the speech to the rival leaving with the Pokedex: the starter pick, the rival's walks, the fight, his exit, the parcel and the Pokedex hand-over. gen1_walk.gd drives it on Red and Blue and tools/preview_world.gd -- red 0 40 <out.png> live lab_rival@5,6 20 0 photographs the player turning to watch him go.
• A call to a map's own routine pushes a return frame on the walk's state, so a routine that branches walks the rest of the row on each side; a jp to a named routine pushes none.
• NPC_CHANGE_FACING is held until the row writes the side over it, FillMemory over wNPCMovementDirections2 is a counted object walk, GetMonName reads a scratch byte, and cp n over wSimulatedJoypadStatesIndex or wNPCNumScriptedSteps is a counted movement test the screen samples at every step boundary of a walk.
• Yellow's $04 to $07 movement rows run at Func_5288's doubled step, cp value under a CheckEitherEventSet mask is one flag set and one clear, and the Pikachu follower routines answer as no follower.

Changed

• Every map-script body but the two link maps decodes on all three cartridges: Red and Blue read 183 state bodies of 373, Yellow 223 of 408, against 173 of 362 and 177 of 361.
• wDoNotWaitForButtonPressAfterDisplayingText lands on the row's last box wherever a routine printed it.

Fixed

• hSpriteMapYCoord is SPRITESTATEDATA2_MAPY, the cell and four: Pewter City's two guides and Bill were placed four cells off.
• SetSpritePosition1 over nothing the row wrote is the restore of GetSpritePosition1's save and no longer ends the walk.
• Gen1WorldImporter._script_node_exact shadowed Object.set.