Refactoring and flexibility changes

* Split game module into game and game_interface
* Move core_lib to corelib
* Move miniwindow to corelib
* Introduce init.lua script for initializing the client, giving much more flexibility
* OTClient is no longer Application derived and is much simpler

modules/corelib/ext/string.lua

@@ -0,0 +1,45 @@
+function string.split(s, delim)
+  local start = 1
+  local results = {}
+  while true do
+    local pos = string.find(s, delim, start, true)
+    if not pos then
+      break
+    end
+    table.insert(results, string.sub(s, start, pos-1))
+    start = pos + string.len(delim)
+  end
+  table.insert(results, string.sub(s, start))
+  table.removevalue(results, '')
+  return results
+end
+
+function string.starts(s, start)
+  return string.sub(s, 1, #start) == start
+end
+
+function string.trim(s)
+  return string.match(s, '^%s*(.*%S)') or ''
+end
+
+function string.explode(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