some fixes and utils

modules/core_lib/core_lib.otmod

@@ -23,6 +23,7 @@ Module
     dofile 'settings'
     dofile 'keyboard'
     dofile 'mouse'
+    dofile 'string'
 
     dofile 'ui/effects'
     dofile 'ui/radiogroup'

modules/core_lib/string.lua

@@ -0,0 +1,21 @@
+string.explode = function (str, sep, limit)
+	if(type(sep) ~= 'string' or tostring(str):len() == 0 or sep:len() == 0) then
+		return {}
+	end
+
+	local i, pos, tmp, t = 0, 1, "", {}
+	for s, e in function() return string.find(str, sep, pos) end do
+		tmp = str:sub(pos, s - 1):trim()
+		table.insert(t, tmp)
+		pos = e + 1
+
+		i = i + 1
+		if(limit ~= nil and i == limit) then
+			break
+		end
+	end
+
+	tmp = str:sub(pos):trim()
+	table.insert(t, tmp)
+	return t
+end