Every GameController fed the same input path (front_mac.m), so the last one moved won, and hle_hid.c reported
exactly one npad whatever the game supports. Now the first controller is player 1, with the keyboard, the next
player 2 and so on up to 8 (pad_slots.h; a removed controller frees its player and gets it back when a
controller of the same name reconnects). Player 1 stays on No1 docked and Handheld in handheld mode, player n is
on No n (No1 stays empty in handheld mode: games take Handheld and No1 both for player 1). The game's supported
npad ids decide how many play: a one-player game ({No1, Handheld}) gets every controller as player 1, a
controller past a game's last player is not used, as on the Switch. A connect or disconnect signals that npad's
style-set event through hle_signal_bound_system_event (hle_thread.c), which signals only an event still bound,
from the macOS main thread where the notifications arrive; player LEDs follow the Switch's patterns; the
controller-support applet reports the connected players, capped at the game's maximum; only player 1 shakes.
DM_PAD_MERGE=1 merges every controller into player 1 as before; DM_KBD_PLAYER=own makes the keyboard player 1 on
its own. One controller, or the keyboard alone, behaves as before. iOS is unchanged: DmGamepad.m still feeds
player 1 and never reports further players.
Rebased onto a678703 (front_mac.m's includes, the Input row of docs/development.md). Checked: host unit tests
pass with the new t_hid (44 checks: slots and reconnects, npads docked and handheld, one- and four-player games,
events, LEDs, the applet); the Mac host builds for Breath of the Wild and Mario Kart 8 Deluxe with no new warning;
hle_hid.c and hle_thread.c pass an iOS SDK syntax check; Hades in a window with the keyboard and DM_KEYS reads
the supported ids (0x10f), and its scripted presses take it past the title. Two controllers were not run here;
the PR's author played Mario Kart 8 Deluxe in 2-player split screen with an Xbox Wireless Controller and a
DUALSHOCK 4, each its own kart, and a controller disconnected and reconnected during play got its slot back.
Co-authored-by: v0lumehi <34629096+v0lumehi@users.noreply.github.com>
