CALL and RET instructions.

Changed PSHP and POPP into CALL and RET, streamlining their use for subroutine calls.
Updated Assembler and Emulator.
New demonstration programs.

Programs/printHello.asm

@@ -0,0 +1,20 @@
+; printHello.asm
+
+; As a demonstration of the new print routines, here's a new implementation for hello.asm
+; Anachronaut
+; 10/27/2024
+
+; Include the subroutine file.
+#Include print.asm
+
+#Program
+Start:
+SETD myString       ; Set the Data Pointer to the string we want to print.
+CALL printString    ; Call the subroutine.
+CALL lineFeed       ; Call the linefeed subroutine.
+HALT                ; Stop the CPU.
+
+#Data
+
+myString:
+  "Hello, World!"