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

src/jvmMain/kotlin/mtmc/asm/ASMElement.kt

@@ -0,0 +1,19 @@
+package mtmc.asm
+
+import mtmc.tokenizer.MTMCToken
+
+abstract class ASMElement(
+  val labels: List<MTMCToken>,
+  @JvmField var lineNumber: Int
+) : HasLocation {
+  @JvmField
+  var errors: MutableList<ASMError> = ArrayList()
+  override var location: Int = 0
+  override var sizeInBytes: Int = 0
+
+  fun addError(token: MTMCToken, error: String) {
+    errors.add(ASMError(token, error))
+  }
+
+  abstract fun addError(integerValueRequired: String)
+}