Add option to remove splash on startup

Adds the setting option 'opus.show_splash'. By default it is set to true. When set to false opus will immediately boot without showing the splash screen. Fairly straightforward.

startup.lua

@@ -117,11 +117,21 @@ local function splash()
 	term.write(str)
 end
 
-term.clear()
-splash()
+local doSplash = true
+if settings then
+	doSplash = settings.get('opus.show_splash')
+	if doSplash == nil then
+		doSplash = true
+		settings.set('opus.show_splash', true)
+		settings.save('.settings')
+	end
+end
+if doSplash then
+	term.clear()
+	splash()
 
-local timerId = os.startTimer(1.5)
-while true do
+	local timerId = os.startTimer(1.5)
+	while true do
 		local e, id = os.pullEvent()
 		if e == 'timer' and id == timerId then
 			break
@@ -134,6 +144,7 @@ while true do
 			end
 			break
 		end
+	end
 end
 
 term.clear()