Make most of functions const correct (#714)

* Make most of the functions const correct

Used clang-tidy and sonarlint to help find places where const could
pretty easily applied. Also lot of hand work.

This commit does not yet touch handlers and typedefs of those.

* Fix Arduino uno handler_who_is() has extra parenthesis

For some reason there is extra parenthesis. Remove it this is more
likely buildable.

* Bugfix/bacapp: Fix uninitilized array_index

We have changed bacapp_snprintf_value() to be const correct. After that
we got

```
/home/runner/work/bacnet-stack/bacnet-stack/src/bacnet/bacapp.c:3183:27: warning: 4th function call argument is an uninitialized value [core.CallAndMessage]
                ret_val = bacapp_snprintf_weeklyschedule(
                          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1 warning generated.
```

So analyzer could now spot that we do not actually initilize array_index
at all. Fix this by setting array_index to zero. Note that I actually do
not know if zeroing is right thing to do here. I choose zero as if this
has worked before it is most likely that it will work with zero value.

* cmake: Add and ignore Wwrite-strings compiler option

Wwrite-strings helps find places where const correctness is broken.

Example it will warn about these

```C

void func1(char* str);

func("test") /* "test" is const so we should not pass it to func1().

char* func2()
{
  return "test"; /* func2() should return const char*.
}
```

We still need to ignore it as not all are fixed but let's add it already
so we remember that it should be opened at some point.

---------

Co-authored-by: Kari Argillander <kari.argillander@fidelix.com>

src/bacnet/bacdest.h

@@ -62,31 +62,35 @@ extern "C" {
 #endif /* __cplusplus */
 
 BACNET_STACK_EXPORT
-int bacnet_destination_encode(uint8_t *apdu, BACNET_DESTINATION *destination);
+int bacnet_destination_encode(
+    uint8_t *apdu, const BACNET_DESTINATION *destination);
 BACNET_STACK_EXPORT
 int bacnet_destination_context_encode(
-    uint8_t *apdu, uint8_t tag_number, BACNET_DESTINATION *destination);
+    uint8_t *apdu, uint8_t tag_number, const BACNET_DESTINATION *destination);
 BACNET_STACK_EXPORT
 int bacnet_destination_decode(
-    uint8_t *apdu, int apdu_len, BACNET_DESTINATION *destination);
+    const uint8_t *apdu, int apdu_len, BACNET_DESTINATION *destination);
 BACNET_STACK_EXPORT
 void bacnet_destination_default_init(BACNET_DESTINATION *destination);
 BACNET_STACK_EXPORT
-bool bacnet_destination_default(BACNET_DESTINATION *destination);
+bool bacnet_destination_default(const BACNET_DESTINATION *destination);
 BACNET_STACK_EXPORT
 bool bacnet_destination_same(
-    BACNET_DESTINATION *dest1, BACNET_DESTINATION *dest2);
+    const BACNET_DESTINATION *dest1, const BACNET_DESTINATION *dest2);
 BACNET_STACK_EXPORT
-void bacnet_destination_copy(BACNET_DESTINATION *dest, BACNET_DESTINATION *src);
+void bacnet_destination_copy(
+    BACNET_DESTINATION *dest, const BACNET_DESTINATION *src);
 
 BACNET_STACK_EXPORT
-void bacnet_recipient_copy(BACNET_RECIPIENT *dest, BACNET_RECIPIENT *src);
+void bacnet_recipient_copy(
+    BACNET_RECIPIENT *dest, const BACNET_RECIPIENT *src);
 BACNET_STACK_EXPORT
-bool bacnet_recipient_same(BACNET_RECIPIENT *r1, BACNET_RECIPIENT *r2);
+bool bacnet_recipient_same(
+    const BACNET_RECIPIENT *r1, const BACNET_RECIPIENT *r2);
 BACNET_STACK_EXPORT
-bool bacnet_recipient_device_wildcard(BACNET_RECIPIENT *recipient);
+bool bacnet_recipient_device_wildcard(const BACNET_RECIPIENT *recipient);
 BACNET_STACK_EXPORT
-bool bacnet_recipient_device_valid(BACNET_RECIPIENT *recipient);
+bool bacnet_recipient_device_valid(const BACNET_RECIPIENT *recipient);
 
 BACNET_STACK_EXPORT
 int bacnet_destination_to_ascii(