add chat panel, send text messages, guard forbidden functions with an ifdef

modules/chat/chat.lua

@@ -0,0 +1,19 @@
+Chat = {}
+
+-- private variables
+local chatPanel
+
+-- public functions
+function Chat.create()
+  chatPanel = loadUI("/chat/chat.otui", Game.gameBottomPanel)
+end
+
+function Chat.destroy()
+  chatPanel:destroy()
+  chatPanel = nil
+end
+
+-- hooked events
+
+connect(Game, { onLogin = Chat.create,
+                onLogout = Chat.destroy })

modules/chat/chat.otmod

@@ -0,0 +1,14 @@
+Module
+  name: chat
+  description: Manage chat window
+  author: OTClient team
+  website: https://github.com/edubart/otclient
+  autoLoad: true
+  dependencies:
+    - game
+
+  onLoad: |
+    require 'chat'
+    return true
+
+

modules/chat/chat.otui

@@ -0,0 +1,30 @@
+ChatLabel < UILabel
+  font: verdana-11px-monochrome
+  height: 16
+
+Panel
+  id: chatPanel
+  anchors.fill: parent
+
+  Panel
+    id: chatBuffer
+    anchors.top: parent.top
+    anchors.left: parent.left
+    anchors.right: parent.right
+    anchors.bottom: next.top
+    margin.right: 6
+    margin.left: 6
+    margin.bottom: 2
+    margin.top: 6
+    layout: verticalBox
+    focusable: false
+
+  LineEdit
+    id: chatLineEdit
+    anchors.left: parent.left
+    anchors.right: parent.right
+    anchors.bottom: parent.bottom
+    margin.right: 6
+    margin.left: 6
+    margin.bottom: 6
+    always focused: true