Fixes illiterate & blind mobs being able to read books (#41400)

cl ShizCalev
fix: Fixed inconsistency where illiterate and blind mobs were able to read some books/manuals, but not others.
fix: Fixed mobs being granted mime speak even if they failed to finish reading the Guide to Advanced Mimery Volumes 1/2.
/cl

Step towards resolving #41396

code/modules/library/lib_codex_gigas.dm

@@ -21,12 +21,8 @@
 	var/currentSection = PRE_TITLE
 
 /obj/item/book/codex_gigas/attack_self(mob/user)
-	if(is_blind(user))
-		to_chat(user, "<span class='warning'>As you are trying to read, you suddenly feel very stupid.</span>")
-		return
-	if(!user.is_literate())
-		to_chat(user, "<span class='notice'>You skim through the book but can't comprehend any of it.</span>")
-		return
+	if(!user.can_read(src))
+		return FALSE
 	if(inUse)
 		to_chat(user, "<span class='notice'>Someone else is reading it.</span>")
 	if(ishuman(user))

code/modules/library/lib_items.dm

@@ -197,12 +197,9 @@
 	var/title			//The real name of the book.
 	var/window_size = null // Specific window size for the book, i.e: "1920x1080", Size x Width
 
+
 /obj/item/book/attack_self(mob/user)
-	if(is_blind(user))
-		to_chat(user, "<span class='warning'>As you are trying to read, you suddenly feel very stupid!</span>")
-		return
-	if(ismonkey(user))
-		to_chat(user, "<span class='notice'>You skim through the book but can't comprehend any of it.</span>")
+	if(!user.can_read(src))
 		return
 	if(dat)
 		user << browse("<TT><I>Penned by [author].</I></TT> <BR>" + "[dat]", "window=book[window_size != null ? ";size=[window_size]" : ""]")