* Source/OpenTK/Platform/X11/X11GLNative.cs: Refactored empty cursor
  creation into its own function. Create one empty cursor for the
  lifetime of the window.
* Source/OpenTK/Platform/X11/X11GLNative.cs: Confine pointer to
  window when it becomes invisible.
* Source/OpenTK/Platform/X11/X11GLNative.cs: Confine pointer to
  window when it becomes invisible.
* Source/OpenTK/OpenTK.csproj:
* Source/OpenTK/Input/Keyboard.cs:
* Source/OpenTK/Input/InputDriver.cs:
* Source/OpenTK/Input/KeyboardState.cs:
* Source/OpenTK/Input/IKeyboardDriver.cs:
* Source/OpenTK/Platform/X11/X11Input.cs:
* Source/OpenTK/Platform/X11/Functions.cs:
* Source/OpenTK/Platform/X11/X11Factory.cs:
* Source/OpenTK/Platform/Windows/WMInput.cs:
* Source/OpenTK/Platform/X11/X11Keyboard.cs:
* Source/OpenTK/Platform/MacOS/CarbonInput.cs:
* Source/OpenTK/Platform/Windows/WinGLNative.cs:
* Source/OpenTK/Platform/Windows/WinRawInput.cs:
* Source/OpenTK/Platform/Windows/WinRawKeyboard.cs: Added initial
  OpenTK.Input.Keyboard implementation for X11.
* Source/OpenTK/OpenTK.csproj:
* Source/OpenTK/Input/Keyboard.cs:
* Source/OpenTK/Input/InputDriver.cs:
* Source/OpenTK/Input/KeyboardState.cs:
* Source/OpenTK/Input/IKeyboardDriver.cs:
* Source/OpenTK/Platform/X11/X11Input.cs:
* Source/OpenTK/Platform/X11/Functions.cs:
* Source/OpenTK/Platform/X11/X11Factory.cs:
* Source/OpenTK/Platform/Windows/WMInput.cs:
* Source/OpenTK/Platform/X11/X11Keyboard.cs:
* Source/OpenTK/Platform/MacOS/CarbonInput.cs:
* Source/OpenTK/Platform/Windows/WinGLNative.cs:
* Source/OpenTK/Platform/Windows/WinRawInput.cs:
* Source/OpenTK/Platform/Windows/WinRawKeyboard.cs: Added initial
  OpenTK.Input.Keyboard implementation for X11.
* Source/OpenTK/Input/Mouse.cs:
* Source/OpenTK/Platform/Factory.cs:
* Source/OpenTK/Input/InputDriver.cs:
* Source/OpenTK/Input/IMouseDriver.cs:
* Source/OpenTK/Platform/X11/X11Input.cs:
* Source/OpenTK/Platform/X11/X11Factory.cs:
* Source/OpenTK/Platform/Windows/WMInput.cs:
* Source/OpenTK/Platform/IPlatformFactory.cs:
* Source/OpenTK/Platform/MacOS/CarbonInput.cs:
* Source/OpenTK/Platform/Windows/WinFactory.cs:
* Source/OpenTK/Platform/MacOS/MacOSFactory.cs:
* Source/OpenTK/Platform/Windows/WinGLNative.cs:
* Source/OpenTK/Platform/Windows/WinRawMouse.cs:
* Source/OpenTK/Platform/Windows/WinRawInput.cs: Added new MouseDriver
  interface and added stub internal implementations.
* Source/OpenTK/Input/Mouse.cs:
* Source/OpenTK/Platform/Factory.cs:
* Source/OpenTK/Input/InputDriver.cs:
* Source/OpenTK/Input/IMouseDriver.cs:
* Source/OpenTK/Platform/X11/X11Input.cs:
* Source/OpenTK/Platform/X11/X11Factory.cs:
* Source/OpenTK/Platform/Windows/WMInput.cs:
* Source/OpenTK/Platform/IPlatformFactory.cs:
* Source/OpenTK/Platform/MacOS/CarbonInput.cs:
* Source/OpenTK/Platform/Windows/WinFactory.cs:
* Source/OpenTK/Platform/MacOS/MacOSFactory.cs:
* Source/OpenTK/Platform/Windows/WinGLNative.cs:
* Source/OpenTK/Platform/Windows/WinRawMouse.cs:
* Source/OpenTK/Platform/Windows/WinRawInput.cs: Added new MouseDriver
  interface and added stub internal implementations.
* Input/KeyboardState.cs: Fixed the amount of storage for keyboard
  keys (the code would allocate one less int than necessary when
  "number of keys % 32" falls between 1 and 15).
Fixed the implementation of the Equals method to compare the two
  instances (instead of comparing this instance against itself).
* Input/KeyboardState.cs: Fixed the amount of storage for keyboard
  keys (the code would allocate one less int than necessary when
  "number of keys % 32" falls between 1 and 15).
Fixed the implementation of the Equals method to compare the two
  instances (instead of comparing this instance against itself).
* Input/MouseState.cs: Implemented MouseState structure.
* Input/MouseState.cs: Implemented MouseState structure.
* X11Keyboard.cs: Do not allocate an X11WindowInfo unnecessarily.
* X11Keyboard.cs: Do not allocate an X11WindowInfo unnecessarily.
* OpenTK.csproj:
* Input/MouseState.cs:
* Input/ButtonState.cs:
* Platform/X11/X11Mouse.cs:
* Platform/X11/X11Factory.cs: Added initial implementation of
  OpenTK.Input.Mouse for X11.
* OpenTK.csproj:
* Input/MouseState.cs:
* Input/ButtonState.cs:
* Platform/X11/X11Mouse.cs:
* Platform/X11/X11Factory.cs: Added initial implementation of
  OpenTK.Input.Mouse for X11.
* Platform/X11/X11Keyboard.cs: Added index bounds check for
  GetState.
* Platform/X11/X11Keyboard.cs: Added index bounds check for
  GetState.
* OpenTK.csproj:
* Input/MouseState.cs:
* Platform/X11/Structs.cs:
* Platform/X11/XI2Mouse.cs:
* Platform/X11/Functions.cs:
* Platform/X11/X11Factory.cs: Added XInput2 driver for mice.
  Multi-mouse support pending.

* Platform/X11/X11Mouse.cs: Log the driver type for debugging
  purposes.
* OpenTK.csproj:
* Input/MouseState.cs:
* Platform/X11/Structs.cs:
* Platform/X11/XI2Mouse.cs:
* Platform/X11/Functions.cs:
* Platform/X11/X11Factory.cs: Added XInput2 driver for mice.
  Multi-mouse support pending.

* Platform/X11/X11Mouse.cs: Log the driver type for debugging
  purposes.
* QuickStart.sln:
* Source/QuickStart/QuickStart.csproj: Added missing QuickStart
solution. Fixes issue [#2093]: "QuickStart.sln doesn't exist in
"latest version of OpenTK"".