Add component and element templates (#59101) (#6195)

* Add component and element templates

* Convert compoinent and element templates to markdown files

* Change element example in template to stateless

* Replace element example with gong moving sound

Co-authored-by: Jonathan Rubenstein <jrubcop@gmail.com>

code/datums/components/COMPONENT_TEMPLATE.md

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+
+# Template file for your new component
+
+See _component.dm for detailed explanations
+
+```dm
+/datum/component/mycomponent
+	//can_transfer = TRUE                   // Must have PostTransfer
+	//dupe_mode = COMPONENT_DUPE_ALLOWED    // code/__DEFINES/dcs/flags.dm
+	var/myvar
+
+/datum/component/mycomponent/Initialize(myargone, myargtwo)
+	if(myargone)
+		myvar = myargone
+	if(myargtwo)
+		send_to_playing_players(myargtwo)
+
+/datum/component/mycomponent/RegisterWithParent()
+	RegisterSignal(parent, COMSIG_NOT_REAL, ./proc/signalproc)                                    // RegisterSignal can take a signal name by itself,
+	RegisterSignal(parent, list(COMSIG_NOT_REAL_EITHER, COMSIG_ALMOST_REAL), ./proc/otherproc)    // or a list of them to assign to the same proc
+
+/datum/component/mycomponent/UnregisterFromParent()
+	UnregisterSignal(parent, COMSIG_NOT_REAL)          // UnregisterSignal has similar behavior
+	UnregisterSignal(parent, list(                     // But you can just include all registered signals in one call
+		COMSIG_NOT_REAL,
+		COMSIG_NOT_REAL_EITHER,
+		COMSIG_ALMOST_REAL,
+	))
+
+/datum/component/mycomponent/proc/signalproc(datum/source)
+	SIGNAL_HANDLER
+	send_to_playing_players("[source] signaled [src]!")
+
+/*
+/datum/component/mycomponent/InheritComponent(datum/component/mycomponent/old, i_am_original, list/arguments)
+	myvar = old.myvar
+
+	if(i_am_original)
+		send_to_playing_players("No parent should have to bury their child")
+*/
+
+/*
+/datum/component/mycomponent/PreTransfer()
+	send_to_playing_players("Goodbye [parent], I'm getting adopted")
+
+/datum/component/mycomponent/PostTransfer()
+	send_to_playing_players("Hello my new parent, [parent]! It's nice to meet you!")
+*/
+
+/*
+/datum/component/mycomponent/CheckDupeComponent(datum/mycomponent/new, myargone, myargtwo)
+	if(myargone == myvar)
+		return TRUE
+*/
+```

code/datums/elements/ELEMENT_TEMPLATE.md

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+
+# Template file for your new element
+
+See _element.dm for detailed explanations
+
+```dm
+/datum/element/myelement
+	element_flags = ELEMENT_BESPOKE | ELEMENT_COMPLEX_DETACH | ELEMENT_DETACH | ELEMENT_NOTAREALFLAG    // code/__DEFINES/dcs/flags.dm
+	//id_arg_index = 2                                                                                  // Use with ELEMENT_BESPOKE
+	var/list/myvar = list()
+
+/datum/element/myelement/Attach(datum/target)
+	if(!ismovable(target))
+		return COMPONENT_INCOMPATIBLE
+	RegisterSignal(target, COMSIG_MOVABLE_MOVED, myproc)
+	to_chat(target, "Hey, you're in your element.")
+
+/datum/element/myelement/Detach(datum/source)
+	UnregisterSignal(source, COMSIG_MOVABLE_MOVED)
+	to_chat(source, "You feel way out of your element.")
+
+/datum/element/myelement/proc/myproc(datum/source)
+	SIGNAL_HANDLER
+	playsound(source, 'sound/effects/gong.ogg', 50, TRUE)
+```