Refactor: Restructure project package hierarchy and add initial implementation for assembler instructions, shell commands, and exception handling.

src/jvmMain/kotlin/mtmc/asm/instructions/ALUOp.kt

@@ -0,0 +1,44 @@
+package mtmc.asm.instructions
+
+import java.util.*
+
+enum class ALUOp(val opCode: Int, val isUnary: Boolean) {
+  ADD(0x0000, false),
+  SUB(0x0001, false),
+  MUL(0x0002, false),
+  DIV(0x0003, false),
+  MOD(0x0004, false),
+  AND(0x0005, false),
+  OR(0x0006, false),
+  XOR(0x0007, false),
+  SHL(0x0008, false),
+  SHR(0x0009, false),
+  MIN(0x000A, false),
+  MAX(0x000B, false),
+  NOT(0x000C, true),
+  LNOT(0x000D, true),
+  NEG(0x000E, true),
+  IMM(0x000F, true);
+
+  companion object {
+    @JvmStatic
+    fun toInteger(instruction: String): Int {
+      return valueOf(instruction.uppercase(Locale.getDefault())).opCode
+    }
+
+    @JvmStatic
+    fun fromInt(opCode: Short): String {
+      return entries[opCode.toInt()].name.lowercase(Locale.getDefault())
+    }
+
+    @JvmStatic
+    fun isALUOp(op: String): Boolean {
+      try {
+        val aluOp = valueOf(op.uppercase(Locale.getDefault()))
+        return true
+      } catch (e: IllegalArgumentException) {
+        return false
+      }
+    }
+  }
+}