Added Global Keyhooks to make the Hud able to React on key hit.
Key events will only be executed if PoE is the foreground window, so that The hud doesnt interfere with other programs.
currently the hooks are set in Program.cs wich might change in the future.
added a little DebugWindow (only in debug-mode) wich can be turned On and Off with the F11 key.
Currently the Global Settings are used to Handle if the Window will be shown or not (and therefore is saved to Settings.txt)
here we might need another way to handle internal flags.