Move ivrinput into openvr folder

Doesn't make sense for it to have it's own folder when there's an openvr
folder now.

src/openvr/ivrinput_manifest.h

@@ -0,0 +1,44 @@
+#pragma once
+#include <QStandardPaths>
+#include <openvr.h>
+#include <easylogging++.h>
+
+namespace input
+{
+/*!
+Initializes IVRInput to point at the correct manifest. Can't be done in the
+constructor body since objects being initialized require this to be set.
+*/
+class Manifest
+{
+public:
+    Manifest()
+    {
+        QString actionManifestPath = QStandardPaths::locate(
+            QStandardPaths::AppDataLocation,
+            QStringLiteral( "action_manifest.json" ) );
+
+        auto error = vr::VRInput()->SetActionManifestPath(
+            actionManifestPath.toStdString().c_str() );
+        if ( error != vr::EVRInputError::VRInputError_None )
+        {
+            LOG( ERROR ) << "Error setting action manifest path: "
+                         << actionManifestPath << ". OpenVR Error: " << error;
+        }
+    }
+
+    // Explicitly deleted because this object should do nothing but run the
+    // constructor during initialization.
+    // Destructor left blank on purpose since there are no terminating calls.
+    ~Manifest() {}
+    // Copy constructor
+    Manifest( const Manifest& ) = delete;
+    // Copy assignment
+    Manifest& operator=( const Manifest& ) = delete;
+    // Move constructor
+    Manifest( const Manifest&& ) = delete;
+    // Move assignment
+    Manifest& operator=( const Manifest&& ) = delete;
+};
+
+} // namespace input