Fix autotracker reload lockup, stale state, and NWA address map detection (#93)

[emosaru]

Summary

Fixes #93 (UI lockup when reloading pack with autotracker connected) plus two related issues uncovered while investigating it.

• AutoTrackerExtension.OnAnyPackageLoadStarting — fully stop autotracking on pack reload (drain in-flight poll, disconnect active provider, fire AutoTrackerStopped, raise Active / StatusBarControl notifications). Previously the connection was preserved across reload, leaving the extension stuck in an "active/running" state that didn't actually refresh until the user manually stopped and restarted.
• LuaMemorySegment.OnSegmentDataUpdated — re-read mCallback inside the dispatched lambda and check ScriptManager.IsLuaLoaded before calling SafeCall. A Dispatch.BeginInvoke posted from an in-flight poll just before reload would otherwise land after ScriptManager.Reset closed the Lua state and invoke a LuaFunction against a closed state — which hangs the UI thread inside NLua. This is the root-cause hang from Emotracker locks up if reloading while autotracker is connected/started #93; the null-check is defense-in-depth in case any dispatched callback slips past the new full-stop.
• NwaDevice.ReadRawDomainAsync — replace stray space with the protocol's ; separator in the CORE_READ command used by the SNES address-map initializer. The malformed command was rejected by snes9x-nwa as a protocol error, causing ROM-header reads to throw and SNES layout detection to silently fall back to LoROM regardless of cartridge mapping.

The reload-handler change is scoped to the state being reloaded — multi-tab/multi-window setups continue polling on their other tabs undisturbed (the existing ReferenceEquals(e.Target, mState) guard).

Test plan

• Reload pack while autotracker is connected → no UI lockup; status bar shows stopped; clicking Start reconnects and resumes polling.
• Reload pack on tab B while tabs A and C also have autotracker running → only B stops; A and C keep polling.
• Connect via NWA to snes9x-nwa with a HiROM cartridge → log shows Detected ROM layout: HiROM instead of LoROM; pack reads land on the correct ROM offsets.
• Connect via NWA with an ExHiROM cartridge → detection picks ExHiROM.

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