feat: comprehensive libretro core improvements — bug fixes, new options, modern API, CUE/CCD detection (#1825)

* fix: libretro core improvements — save state bug, aspect ratio, controller types, input polling

- Fix double zfile_fclose in retro_unserialize (restore_state_file
  already closes via savestate_restore_finish)
- Fix retro_serialize_size to sum all RAM boards (MAX_RAM_BOARDS)
  with z3chipmem/mbresmem and increase overhead from 2MB to 8MB
- Add RETRO_ENVIRONMENT_SET_SUPPORT_NO_GAME for Workbench boot
- Use fixed 4:3 aspect ratio instead of raw pixel ratio
- Add CD32 Pad and Joystick controller subtypes
- Add RETRO_ENVIRONMENT_GET_PERF_INTERFACE for profiling
- Fix mouse polling to support both Amiga ports (was hardcoded to 1)
- Skip input polling for ports configured as RETRO_DEVICE_NONE
- Extract Makefile version from CMakeLists.txt instead of hardcoding

* fix: mask device subclass IDs for joyport auto-ordering

RETRO_DEVICE_SUBCLASS values (CD32 Pad, Joystick) encode the subclass
in the upper bits. The joyport auto-ordering logic compared the raw
device ID against RETRO_DEVICE_JOYPAD, causing subclass selections
to be treated as non-joypad devices. Apply RETRO_DEVICE_MASK before
comparison, matching how poll_input() already handles these values.

* fix: harden libretro core — defensive fixes and modern API adoption

- Guard environ_cb against NULL before first use in retro_set_environment
- Replace all bare strdup() calls in core_entry() with safe_strdup that
  tracks allocation failures; skip amiberry_main if OOM occurs
- Declare serialization quirks (CORE_VARIABLE_SIZE, MUST_INITIALIZE) so
  frontends handle variable save-state sizes and pre-init correctly
- Upgrade show_message() to SET_MESSAGE_EXT with severity, duration in
  ms, and priority; falls back to legacy SET_MESSAGE automatically
- Warn on unreadable disk paths in replace_image_index (accept anyway
  since the file may appear later, e.g. network mount)
- Truncate WHDLoad sanitized filenames to 200 chars to prevent
  filesystem path-length overflows on extraction

* feat: add core options, audio API, superhires geometry, CUE/CCD parsing, disk mutex

Phase 3 — Core options expansion:
- amiberry_sound_filter: off/emulated/on (Amiga low-pass filter)
- amiberry_stereo_separation: 0-10 (Amiga hard-panned audio mixing)
- amiberry_floppy_speed: turbo/1x/2x/4x/8x
- amiberry_video_standard: auto/PAL/NTSC (core restart required)

Phase 4 — Audio API:
- Register SET_MINIMUM_AUDIO_LATENCY (64ms) to reduce crackling on
  50Hz PAL content running on 60Hz displays
- Register SET_AUDIO_BUFFER_STATUS_CALLBACK to receive underrun alerts

Phase 5 — Video geometry:
- Increase MAX_GFX_WIDTH from 1280 to 1920 and MAX_GFX_HEIGHT from
  1024 to 1280, matching the draw buffer dimensions so superhires
  modes (1508px wide) are not clamped by initial geometry

Phase 6 — Disk improvements:
- Implement CUE sheet parser (detect_cd_content_from_cue): parses
  FILE/TRACK directives, resolves binary path, reads sector 16
  with correct offset for MODE1/2048 and MODE1/2352 sector sizes
- Implement CCD parser (detect_cd_content_from_ccd): finds companion
  .img file with raw 2352-byte sectors and reads sector 16
- Replace TODO heuristic with actual CUE/CCD detection in
  detect_cd_content()
- Add std::mutex protection to all disk control callbacks to prevent
  race conditions from concurrent frontend/emulator access

* fix: address PR review — subclass masking, aspect ratio, CUE case-sensitivity

- Apply RETRO_DEVICE_MASK in apply_port_device() so CD32 Pad and
  Joystick subclass IDs are correctly recognized as joypads
- Remove redundant amiga_aspect_ratio() helper; inline 4:3 constant
- Make CUE parser fully case-insensitive via lowercase copy matching

Author: midwan

libretro/Makefile

@@ -100,10 +100,19 @@ ifeq ($(SANITIZE), 1)
    LDFLAGS += -fsanitize=address
 endif
 
+# Extract version from root CMakeLists.txt (single source of truth)
+AMIBERRY_VERSION := $(shell sed -n 's/^.*VERSION \([0-9][0-9]*\.[0-9][0-9]*\.[0-9][0-9]*\).*/\1/p' $(AMIBERRY_DIR)/CMakeLists.txt | head -1)
+ifeq ($(AMIBERRY_VERSION),)
+AMIBERRY_VERSION := 0.0.0
+endif
+AMIBERRY_VERSION_MAJOR := $(word 1,$(subst ., ,$(AMIBERRY_VERSION)))
+AMIBERRY_VERSION_MINOR := $(word 2,$(subst ., ,$(AMIBERRY_VERSION)))
+AMIBERRY_VERSION_PATCH := $(word 3,$(subst ., ,$(AMIBERRY_VERSION)))
+
 # Add Amiberry defines
 FLAGS += -DAMIBERRY -DLIBRETRO -DUTF8PROC_STATIC -D_FILE_OFFSET_BITS=64 -DAMIBERRY_DATADIR=\".\" -DAMIBERRY_LIBDIR=\".\"
-FLAGS += -DAMIBERRY_VERSION=\"8.0.0\" -DAMIBERRY_VERSION_PRE_RELEASE=\"\"
-FLAGS += -DAMIBERRY_VERSION_MAJOR=8 -DAMIBERRY_VERSION_MINOR=0 -DAMIBERRY_VERSION_PATCH=0
+FLAGS += -DAMIBERRY_VERSION=\"$(AMIBERRY_VERSION)\" -DAMIBERRY_VERSION_PRE_RELEASE=\"\"
+FLAGS += -DAMIBERRY_VERSION_MAJOR=$(AMIBERRY_VERSION_MAJOR) -DAMIBERRY_VERSION_MINOR=$(AMIBERRY_VERSION_MINOR) -DAMIBERRY_VERSION_PATCH=$(AMIBERRY_VERSION_PATCH)
 FLAGS += -DAMIBERRY_IS_PRE_RELEASE=0
 FLAGS += -DAMIBERRY_BUILD_YEAR=$(shell date +%Y) -DAMIBERRY_BUILD_MONTH=$(shell date +%-m) -DAMIBERRY_BUILD_DAY=$(shell date +%-d)
 FLAGS += -DAMIBERRY_BUILD_DATE=\"$(shell date +%Y-%m-%d)\"