Move print(n)str from core to shell

These routines had hardcoded references to ACIA and didn't belong to the
core.

parts/core.asm

@@ -176,41 +176,6 @@ parseHexPair:
 	pop	bc
 	ret
 
-; print null-terminated string pointed to by HL
-printstr:
-	push	af
-	push	hl
-
-.loop:
-	ld	a, (hl)		; load character to send
-	or	a		; is it zero?
-	jr	z, .end		; if yes, we're finished
-	call	aciaPutC
-	inc	hl
-	jr	.loop
-
-.end:
-	pop	hl
-	pop	af
-	ret
-
-; print A characters from string that HL points to
-printnstr:
-	push	bc
-	push	hl
-
-	ld	b, a
-.loop:
-	ld	a, (hl)		; load character to send
-	call	aciaPutC
-	inc	hl
-	djnz	.loop
-
-.end:
-	pop	hl
-	pop	bc
-	ret
-
 ; Compares strings pointed to by HL and DE up to A count of characters. If
 ; equal, Z is set. If not equal, Z is reset.
 strncmp:

parts/shell.asm

@@ -123,6 +123,41 @@ shellLoop:
 .prompt:
 	.db	"> ", 0
 
+; print null-terminated string pointed to by HL
+printstr:
+	push	af
+	push	hl
+
+.loop:
+	ld	a, (hl)		; load character to send
+	or	a		; is it zero?
+	jr	z, .end		; if yes, we're finished
+	SHELL_PUTC
+	inc	hl
+	jr	.loop
+
+.end:
+	pop	hl
+	pop	af
+	ret
+
+; print A characters from string that HL points to
+printnstr:
+	push	bc
+	push	hl
+
+	ld	b, a
+.loop:
+	ld	a, (hl)		; load character to send
+	SHELL_PUTC
+	inc	hl
+	djnz	.loop
+
+.end:
+	pop	hl
+	pop	bc
+	ret
+
 printcrlf:
 	ld	a, ASCII_CR
 	SHELL_PUTC