Circuits Update One (#6852)

Ports a buuuuunch of circuits from Polaris.
Allows metabolic siphons and internal energy siphons to consume power to feed their host.
Ports /tg/ circuits too while I'm at it.
Increases base size and complexity for circuits. You're all adults. Hopefully. Don't abuse it.
Ports the integrated circuit detailer.

code/_helpers/text.dm

@@ -396,6 +396,11 @@ proc/TextPreview(var/string,var/len=40)
 		. += ascii2text(letter)
 	. = jointext(.,null)
 
+/proc/random_string(length, list/characters)
+	. = ""
+	for(var/i=1, i<=length, i++)
+		. += pick(characters)
+
 #define starts_with(string, substring) (copytext(string,1,1+length(substring)) == substring)
 
 #define gender2text(gender) capitalize(gender)
@@ -478,7 +483,7 @@ proc/TextPreview(var/string,var/len=40)
 	var/next_backslash = findtext(string, "\\")
 	if(!next_backslash)
 		return string
-	
+
 	var/leng = length(string)
 
 	var/next_space = findtext(string, " ", next_backslash + 1)

code/_helpers/type2type.dm

@@ -262,3 +262,27 @@ proc/tg_list2text(list/list, glue=",")
 
 /proc/isLeap(y)
 	return ((y) % 4 == 0 && ((y) % 100 != 0 || (y) % 400 == 0))
+
+/proc/strtohex(str)
+	if(!istext(str)||!str)
+		return
+	var/r
+	var/c
+	for(var/i = 1 to length(str))
+		c= text2ascii(str,i)
+		r+= num2hex(c)
+	return r
+
+// Decodes hex to raw byte string.
+// If safe=TRUE, returns null on incorrect input strings instead of CRASHing
+/proc/hextostr(str, safe=FALSE)
+	if(!istext(str)||!str)
+		return
+	var/r
+	var/c
+	for(var/i = 1 to length(str)/2)
+		c = hex2num(copytext(str,i*2-1,i*2+1), safe)
+		if(isnull(c))
+			return null
+		r += ascii2text(c)
+	return r