Adds a set of new admin verbs for narrating (obj &mob)

*Adds verbs to client: Narrate Entity, ... (Add ref), ... (Remove ref), ... (Interface)
* Adds new Client var to hold reference to entity_narrate datum instance
*Creates entity_narrate datum to hold list of unique/custom entity names, and an assoc list of name:atomref
* All listed client verbs initialize the datum onto the client var for later use when first used
* User is expected to right click mobs within viewrange to add them to ref list
* User is prompted to create a unique identifier to generate the key:value pair
* User may either request an interface to do the narration (interface)
* User may alternatively go narrate-mob "identifier" "speak/emote" "narration" into command line
* In case of argument call, message may be ommited to bring up non-multiline tgui_input_text
* User may remove entities from their personal list at will
* Users adding entities to their personal list are logged
* Users attempting to add players to their personal list are likewise logged
* Users succeeding despite this are logged if they try to speak for them
* If type is mob/living, it uses .say and .custom_emote() procs
* .say uses the mob's languages, stutters and so forth
* if type is obj/, user must specific speech verb when composing narration.
* User may narrate from any range.
* Each proc checks for R_FUN permission and prevents using if lacking rights

code/modules/client/client defines.dm

@@ -13,6 +13,7 @@
 	var/last_message	= "" //Contains the last message sent by this client - used to protect against copy-paste spamming.
 	var/last_message_count = 0 //contins a number of how many times a message identical to last_message was sent.
 	var/ircreplyamount = 0
+	var/entity_narrate_holder //Holds /datum/entity_narrate when using the relevant admin verbs.
 
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