Saycode refactor/improvements

- Refactored multiple bits of saycode to be less eyeburning code
 - Radios now properly report special channel messages (binary, hivemind)
 - Animals with no speak list no longer show unfiltered messages to
   everyone.

 - Fun part:
   - Improves handling of headsets for the two ear system.
     - The right headset will now be talked into if the left headset
       reports that it is unable to send the message on the chosen
       channel/mode.
     - This means that instead of having to swap headsets around, wearing
       a headset on either ear will grant you access to all of it's
       channels.
     - The left headset will take priority, which really only affects when
       it's set to a non-standard frequency.

code/__DEFINES/is_helpers.dm

@@ -1,3 +1,5 @@
 #define isatom(A) istype(A, /atom)
 #define ismovableatom(A) istype(A, /atom/movable)
-#define isclient(A) istype(A, /client)
+#define isclient(A) istype(A, /client)
+
+#define isradio(A) istype(A, /obj/item/device/radio)

code/__DEFINES/misc.dm

@@ -269,3 +269,7 @@
 
 // Macro to get the current elapsed round time, rather than total world runtime
 #define ROUND_TIME (round_start_time ? (world.time - round_start_time) : 0)
+
+// Used by radios to indicate that they have sent a message via something other than subspace
+#define RADIO_CONNECTION_FAIL 0
+#define RADIO_CONNECTION_NON_SUBSPACE 1

code/__DEFINES/mob.dm

@@ -103,10 +103,7 @@
 #define CHEM_MOB_SPAWN_HOSTILE   1
 #define CHEM_MOB_SPAWN_FRIENDLY  2
 
-#define isobserver(A)	(istype((A), /mob/dead/observer))
 #define isliving(A)		(istype((A), /mob/living))
-#define isAutoAnnouncer(A)	(istype((A), /mob/living/automatedannouncer))
-
 #define iscarbon(A)		(istype((A), /mob/living/carbon))
 #define ishuman(A)		(istype((A), /mob/living/carbon/human))
 #define isbrain(A)		(istype((A), /mob/living/carbon/brain))
@@ -127,12 +124,18 @@
 #define isrobot(A)		(istype((A), /mob/living/silicon/robot))
 #define ispAI(A)		(istype((A), /mob/living/silicon/pai))
 
+#define isAutoAnnouncer(A)	(istype((A), /mob/living/automatedannouncer))
+
 #define isAIEye(A)		(istype((A), /mob/camera/aiEye))
 #define isovermind(A)	(istype((A), /mob/camera/blob))
 
 #define isSpirit(A)		(istype((A), /mob/spirit))
 #define ismask(A)		(istype((A), /mob/spirit/mask))
 
+#define isobserver(A)	(istype((A), /mob/dead/observer))
+
+#define isnewplayer(A)  (istype((A), /mob/new_player))
+
 #define isorgan(A)		(istype((A), /obj/item/organ/external))
 #define hasorgans(A)	(ishuman(A))