feat: list recalbox cores per board

Recalbox builds seven board images with different emulators. The new
target scraper reads each board's defconfig against the package every
system.ini core names. The names that reached no profile are mapped to
the projects Recalbox builds or profiled from their source, and the
mupen64plus video plugins are set aside.

platforms/_registry.yml

@@ -211,8 +211,8 @@ platforms:
     # Bios.cpp:64-68 hashes a .zip with Zip::Md5Composite, never its bytes
     zip_digest: composite
     schedule: monthly
-    target_scraper: null
-    target_source: null
+    target_scraper: recalbox_targets
+    target_source: https://gitlab.com/recalbox/recalbox/-/tree/master/configs
     install:
       detect:
       - os: linux

platforms/targets/_overrides.yml

@@ -128,3 +128,27 @@ rocknix:
         - wine
     amd64:
       aliases: [x86_64, pc]
+
+recalbox:
+  targets:
+    _default:
+      # system.ini names a mupen64plus video plugin as the core of the
+      # mupen64plus emulator; mupenGenerator.py loads it with --gfx
+      # mupen64plus-video-<core>.so. Plugins, not emulators.
+      remove_cores:
+        - glide64mk2 # mupen64plus-video-glide64mk2
+        - gliden64 # GLideN64 video plugin
+        - n64_gles2 # mupen64plus-video-gles2n64
+        - rice # mupen64plus-video-rice
+        - rice_gles2 # mupen64plus-video-gles2rice
+    # Recalbox names its boards by defconfig (configs/recalbox-<board>_defconfig).
+    rpi3:
+      aliases: [rpi3b]
+    rpi4_64:
+      aliases: [rpi4, rpi400]
+    rpi5_64:
+      aliases: [rpi5]
+    rpizero2:
+      aliases: [rpi-zero2]
+    x86_64:
+      aliases: [pc]