rework key input handling, add more script events for UI and implement console history

modules/core/ext/string.lua

@@ -0,0 +1,14 @@
+function string:split(sep)
+  local t = { }
+  local function helper(word)
+    table.insert(t, word)
+    return ""
+  end
+  if not self:gsub("%w+", helper):find("%S") then
+    return t
+  end
+end
+
+function string:starts(start)
+   return self:sub(1, #start) == start
+end