access: wire extracted modules into diablo.cpp and build system

Remove ~4,042 lines of extracted function bodies and forward
declarations from diablo.cpp. Add includes for the 6 new module
headers. Update CancelAutoWalkInternal() to delegate to
ResetAutoWalkTracker() and ResetAutoWalkTownNpc().

Remove unused includes from diablo.cpp that were only needed by the
extracted code (<queue>, format_int.hpp, tile_properties.hpp).

Add the 6 new .cpp files to Source/CMakeLists.txt so they are
compiled into libdevilutionx.

Also includes post-review cleanups:
- Remove unused automap.h include from accessibility_keys.cpp
- Remove unused walk_path_speech.hpp include from diablo.cpp
- Replace .size() == 0 with .empty() in accessibility_keys.cpp
- Simplify CanAutomapBeToggledOff to direct return expression
- Remove unreachable dead code and dead FindPreferredExitTriggerIndex
  function from navigation_speech.cpp

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Source/CMakeLists.txt

@@ -41,6 +41,7 @@ set(libdevilutionx_SRCS
   control/control_infobox.cpp
   control/control_panel.cpp
 
+  controls/accessibility_keys.cpp
   controls/axis_direction.cpp
   controls/controller_motion.cpp
   controls/controller.cpp
@@ -51,6 +52,8 @@ set(libdevilutionx_SRCS
   controls/menu_controls.cpp
   controls/modifier_hints.cpp
   controls/plrctrls.cpp
+  controls/town_npc_nav.cpp
+  controls/tracker.cpp
 
   DiabloUI/button.cpp
   DiabloUI/credits.cpp
@@ -160,13 +163,16 @@ set(libdevilutionx_SRCS
   tables/textdat.cpp
   tables/townerdat.cpp
 
+  utils/accessibility_announcements.cpp
   utils/display.cpp
-  utils/language.cpp
-  utils/proximity_audio.cpp
-  utils/sdl_bilinear_scale.cpp
-  utils/sdl_thread.cpp
-  utils/surface_to_clx.cpp
-  utils/timer.cpp)
+  utils/language.cpp
+  utils/navigation_speech.cpp
+  utils/proximity_audio.cpp
+  utils/sdl_bilinear_scale.cpp
+  utils/sdl_thread.cpp
+  utils/surface_to_clx.cpp
+  utils/timer.cpp
+  utils/walk_path_speech.cpp)
 
 # These files are responsible for most of the runtime in Debug mode.
 # Apply some optimizations to them even in Debug mode to get reasonable performance.
@@ -739,15 +745,15 @@ target_link_dependencies(libdevilutionx_utf8 PRIVATE
   SheenBidi::SheenBidi
 )
 
-if(NOSOUND)
-  add_devilutionx_object_library(libdevilutionx_sound
-    effects_stubs.cpp
-    engine/sound_pool_stubs.cpp
-    engine/sound_stubs.cpp
-  )
-  target_link_dependencies(libdevilutionx_sound PUBLIC
-    DevilutionX::SDL
-    fmt::fmt
+if(NOSOUND)
+  add_devilutionx_object_library(libdevilutionx_sound
+    effects_stubs.cpp
+    engine/sound_pool_stubs.cpp
+    engine/sound_stubs.cpp
+  )
+  target_link_dependencies(libdevilutionx_sound PUBLIC
+    DevilutionX::SDL
+    fmt::fmt
     magic_enum::magic_enum
     tl
     unordered_dense::unordered_dense
@@ -755,15 +761,15 @@ if(NOSOUND)
     libdevilutionx_random
     libdevilutionx_sdl2_to_1_2_backports
   )
-else()
-  add_devilutionx_object_library(libdevilutionx_sound
-    effects.cpp
-    engine/sound_pool.cpp
-    engine/sound.cpp
-    utils/soundsample.cpp
-  )
-  if(USE_SDL3)
-    target_link_dependencies(libdevilutionx_sound PUBLIC
+else()
+  add_devilutionx_object_library(libdevilutionx_sound
+    effects.cpp
+    engine/sound_pool.cpp
+    engine/sound.cpp
+    utils/soundsample.cpp
+  )
+  if(USE_SDL3)
+    target_link_dependencies(libdevilutionx_sound PUBLIC
       SDL3_mixer::SDL3_mixer
     )
   else()