Added CONIO cursor support.

For quite some time I deliberately didn't add cursor support to the Apple II CONIO imöplementation. I consider it inappropriate to increase the size of cgetc() unduly for a rather seldom used feature.

There's no hardware cursor on the Apple II so displaying a cursor during keyboard input means reading the character stored at the cursor location, writing the cursor character, reading the keyboard and finally writing back the character read initially.

The naive approach is to reuse the part of cputc() that determines the memory location of the character at the cursor position in order to read the character stored there. However that means to add at least one additional JSR / RTS pair to cputc() adding 4 bytes and 12 cycles :-( Apart from that this approach means still a "too" large cgetc().

The approach implemented instead is to include all functionality required by cgetc() into cputc() - which is to read the current character before writing a new one. This may seem surprising at first glance but an LDA(),Y / TAX sequence adds only 3 bytes and 7 cycles so it cheaper than the JSR / RTS pair and allows to brings down the code increase in cgetc() down to a reasonable value.

However so far the internal cputc() code in question saved the X register. Now it uses the X register to return the old character present before writing the new character for cgetc(). This requires some rather small adjustments in other functions using that internal cputc() code.

libsrc/apple2/cvline.s

@@ -23,12 +23,13 @@ _cvline:
         .endif
 
 cvlinedirect:
+        stx     tmp1
         cmp     #$00            ; Is the length zero?
         beq     done            ; Jump if done
-        sta     tmp1
-:       txa                     ; Screen code
+        sta     tmp2
+:       lda     tmp1            ; Screen code
         jsr     putchar         ; Write, no cursor advance
         jsr     newline         ; Advance cursor to next line
-        dec     tmp1
+        dec     tmp2
         bne     :-
 done:   rts