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

@@ -117,6 +117,16 @@ local function splash()
 	term.write(str)
 end
 
+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()
 
@@ -135,6 +145,7 @@ while true do
 			break
 		end
 	end
+end
 
 term.clear()
 term.setCursorPos(1, 1)