Changed/Fixed Text Windows, Text Message, Hotkeys Manager, Game Interface and Quest Log

* Renamed game_textbooks to game_textwindow.
* Fixed text window from opening multiple times, and is destroyed correctly.
* Added new game_playerdeath module (moved death message and window here).
* Hotkey window will hide on game end.
* Logout/Exit/Stackable Items/Questlog/Hotkeys windows will now close on game end.

modules/game_textwindow/textwindow.otmod

@@ -0,0 +1,15 @@
+Module
+  name: game_textwindow
+  description: Allow to edit text books and lists
+  author: edubart, BeniS
+  website: www.otclient.info
+
+  dependencies:
+    - game_interface
+
+  @onLoad: |
+    dofile 'textwindow'
+    TextWindow.init()
+
+  @onUnload: |
+    TextWindow.terminate()