Arnitech controller: the TOD set at boot, and a jump table at $FF00

A new option, ARNITECH_CONTROLLER, on in the mc64 configuration only.
IOINIT starts timer A with CIA #1's TOD on 50 Hz, the mc64's mains, and
if the Arnitech controller's signature "ARNI" is at $DE80, latches its
clock and copies its real time into the TOD, hours first and tenths
last, flipping bit 7 of an hour of 12 first, since the CIA flips it
back when 12 is written. Without the signature the TOD is left alone.

The Arnitech jump table at $FF00: "ARNI", version $01, two entries, and
JMPs from $FF06: $FF06 finds the first Card slot holding a Card of the
type in A (carry clear, the slot in A, its Card window's low byte in
X; carry set if none or no controller), $FF09 sets the TOD as IOINIT
does. $FF48-$FF80 stay clear. The code is in new files under
src/kernal/arnitech; other configurations build as before.

src/aliases/,aliases_hardware_arnitech.s

@@ -0,0 +1,26 @@
+
+;
+; Names of the Arnitech controller's registers, on the expansion port's I/O1 (mc64 only)
+;
+; See arnitech's ADR 0023, "The Arnitech controller answers $DE80-$DE9F, and six Card windows
+; follow it" (https://git.susdog.de/chris/arnitech, docs/adr/0023-arnitech-controller-register-map.md)
+;
+
+
+!ifdef CONFIG_ARNITECH_CONTROLLER {
+
+	!addr ARNITECH_SIGNATURE   = $DE80  ; "ARNI", 4 bytes
+	!addr ARNITECH_VERSION     = $DE84
+	!addr ARNITECH_SLOT_COUNT  = $DE85  ; Card slots in this Case
+	!addr ARNITECH_IRQ_STATUS  = $DE86
+	!addr ARNITECH_IRQ_MASK    = $DE87
+	!addr ARNITECH_SLOT_TABLE  = $DE88  ; the type of the Card in slots 0-5, $00 for none
+
+	!addr ARNITECH_CLOCK_LATCH = $DE90  ; a read copies the clock into $DE91-$DE9E
+	!addr ARNITECH_CLOCK_TEN   = $DE91  ; real time as CIA1's TOD reads it: tenths,
+	!addr ARNITECH_CLOCK_SEC   = $DE92  ; seconds,
+	!addr ARNITECH_CLOCK_MIN   = $DE93  ; minutes,
+	!addr ARNITECH_CLOCK_HRS   = $DE94  ; hours, BCD 1-12, bit 7 PM
+
+	!addr ARNITECH_CARD_WINDOW = $DEA0  ; slot n's Card window at $DEA0 + 16 * n
+}