refactor: Humongous Commit

Major architectural refactorbto focus exclusively on JIT development.

JIT & Decoder Architecture
-    Implemented scripts/generate_jit_decoder_a32_table.py to parse
     instruction definitions at build-time rather than runtime.
-    Moves decoder lookup tables from RAM to ROM.

Scope Reduction:
-    Removed frontend, GUI, and rendering dependencies.
-    delete src/frontend, src/target, and associated design docs.

Most importantly, this commit starts the transition of this codebase
from C++ to C. I cant stand creating C++ code, and since no one else
is contributing to this project this change shouldnt matter.

Signed-off-by: Ronald Caesar <github43132@proton.me>

src/jit/decoder/arm32.c

@@ -0,0 +1,42 @@
+#include "arm32.h"
+#include "arm32_table_generated.h"
+#include "common/passert.h"
+#include <string.h>
+#include <stdbool.h>
+
+#define LOG_MODULE "jit"
+#include "common/logging.h"
+
+const pvm_jit_decoder_arm32_instruction_info_t *
+pvm_jit_decoder_arm32_decode (const uint32_t instruction)
+{
+    /* Extract hash key: Bits [27:20] and [7:4] */
+    const uint32_t major = (instruction >> 20U) & 0xFFU;
+    const uint32_t minor = (instruction >> 4U) & 0xFU;
+
+    const uint16_t index = (uint16_t)((major << 4U) | minor);
+
+    const decode_bucket_t *bucket = &g_decoder_lookup_table[index];
+
+    for (size_t i = 0; i < bucket->count; ++i)
+    {
+        const pvm_jit_decoder_arm32_instruction_info_t *info = bucket->instructions[i];
+
+        if ((instruction & info->mask) == info->expected)
+        {
+            if (0 == strcmp(info->name, "UDF"))
+            {
+                LOG_WARNING("Instruction 0x%08X is undefined", instruction);
+            }
+            else
+            {
+                LOG_TRACE("Instruction found for 0x%08X: %s", instruction, info->name);
+            }
+            return info;
+        }
+    }
+
+    LOG_WARNING("Cannot decode instruction 0x%08X", instruction);
+    return NULL;
+}
+