Ports a rewritten version of BAYSTRUMENTS (#11680)

* bay instruments

* k

* AAA

* remove that

* changes

* Update _instrument_key.dm

* safety nets

* @ghommie fixed

* volume

* Update item.dm

* Update item.dm

Co-authored-by: Ghom <42542238+Ghommie@users.noreply.github.com>

code/modules/instruments/instrument_data/synth_tones.dm

@@ -0,0 +1,19 @@
+/datum/instrument/tones
+	name = "Ideal tone"
+	category = "Tones"
+	abstract_type = /datum/instrument/tones
+
+/datum/instrument/tones/square_wave
+	name = "Ideal square wave"
+	id = "square"
+	real_samples = list("81"='sound/instruments/synthesis_samples/tones/Square.ogg')
+
+/datum/instrument/tones/sine_wave
+	name = "Ideal sine wave"
+	id = "sine"
+	real_samples = list("81"='sound/instruments/synthesis_samples/tones/Sine.ogg')
+
+/datum/instrument/tones/saw_wave
+	name = "Ideal sawtooth wave"
+	id = "saw"
+	real_samples = list("81"='sound/instruments/synthesis_samples/tones/Sawtooth.ogg')