Feature/integrated touchserver (#1015)

* WINDOWS: Touch server integrated into module

The touch server functionality has been integrated into the touch module
which is enabled by-default when the touch module is used on a windows
build.
The touch-hook checks for a connected digitizer (pen or touchscreen, but
I haven't tested pen)

This commit should also fix two potential low-risk race conditions in
the tuioear.cpp file.

* Added comment regarding which window we use

* Added copyright notice on the win32_touch files

Also changed from #pragma to #ifndef

* Fixes based on review

- Added anonymous namespace
- Put win32hook in openspace namespace
- Fixed indentations and linebreaks
- Fixed an issue regarding global state deinitialization

modules/touch/touchmodule.cpp

@@ -23,6 +23,7 @@
  ****************************************************************************************/
 
 #include <modules/touch/touchmodule.h>
+#include <modules/touch/include/win32_touch.h>
 
 #include <modules/webgui/webguimodule.h>
 #include <openspace/engine/globals.h>
@@ -156,6 +157,14 @@ TouchModule::TouchModule()
     global::callback::initializeGL.push_back([&]() {
         LDEBUGC("TouchModule", "Initializing TouchMarker OpenGL");
         _markers.initialize();
+#ifdef WIN32
+    // We currently only support one window of touch input internally
+    // so here we grab the first window-handle and use it.
+    void* nativeWindowHandle = global::windowDelegate.getNativeWindowHandle(0);
+    if (nativeWindowHandle) {
+        _win32TouchHook.reset(new Win32TouchHook(nativeWindowHandle));
+    }
+#endif //WIN32
     });
 
     global::callback::deinitializeGL.push_back([&]() {
@@ -190,4 +199,8 @@ TouchModule::TouchModule()
 
 }
 
+TouchModule::~TouchModule() {
+    //intentionally left empty
+}
+
 } // namespace openspace