Initial commit: FT812 Viewer (reworked - no .XM/.XMZ)

Wild Commander plugin for JPG/PNG/DLS/DXP/AVI via the FT812 (EVE) chip.
XM/XMZ support (and the ESP32 audio-playback code it needed) has been
removed here so this plugin can be installed alongside xmplay
(https://git.alexkorochinskiy.ru/alex/xmplayer.git) without both
registering for the same extensions - see README.md.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

src/wc_h.c

@@ -0,0 +1,28 @@
+
+#include <defs.h>
+#include <wc_h.h>
+
+static const WC_HDR hdr =
+{
+  /* +00 -reserved-          */   "",
+  /* +16 Magic string        */   {'W', 'i', 'l', 'd', 'C', 'o', 'm', 'm', 'a', 'n', 'd', 'e', 'r', 'M', 'D', 'L'},
+  /* +32 Format version      */   7,
+  /* +33 -reserved-          */   "",
+  /* +34 Number of pages     */   1,
+  /* +35 Page at 0x8000      */   0,
+  /* +36 Page definitions    */   {
+  /*  +0 Page, +1 NBlocks    */     {0, N_BLK0}
+  /*                         */   },
+  /* +48 -reserved-          */   "",
+  /* +64 Extensions          */   {
+  /*                         */     {'J', 'P', 'G'},
+  /*                         */     {'P', 'N', 'G'},
+  /*                         */     {'D', 'L', 'S'},
+  /*                         */     {'D', 'X', 'P'},
+  /*                         */     {'A', 'V', 'I'},
+  /*                         */   },
+  /* +160 0x00               */   "",
+  /* +161 Max file size      */   0xFFFFFFFF,
+  /* +165 Plugin name        */   "FT812 Viewer",
+  /* +197 Starting condition */   SC_MENU   // also run by extension
+};