Add license and fix warning

Also clean out some now unused files

LICENSE.md

@@ -0,0 +1,22 @@
+jlqml is licensed under the MIT "Expat" License:
+
+> Copyright (c) 2015: Bart Janssens.
+>
+> Permission is hereby granted, free of charge, to any person obtaining
+> a copy of this software and associated documentation files (the
+> "Software"), to deal in the Software without restriction, including
+> without limitation the rights to use, copy, modify, merge, publish,
+> distribute, sublicense, and/or sell copies of the Software, and to
+> permit persons to whom the Software is furnished to do so, subject to
+> the following conditions:
+>
+> The above copyright notice and this permission notice shall be
+> included in all copies or substantial portions of the Software.
+>
+> THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+> EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+> MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+> IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+> CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+> TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+> SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

application_manager.cpp

@@ -42,7 +42,6 @@ ApplicationManager::~ApplicationManager()
 // Initialize the QApplication instance
 void ApplicationManager::init_application()
 {
-  qputenv("QML_PREFIX_PATH", QProcessEnvironment::systemEnvironment().value("QML_PREFIX_PATH").toLocal8Bit());
   qputenv("QSG_RENDER_LOOP", QProcessEnvironment::systemEnvironment().value("QSG_RENDER_LOOP").toLocal8Bit());
   if(m_app != nullptr && !m_quit_called)
   {

listmodel.cpp

@@ -165,7 +165,7 @@ void ListModel::emit_roles_changed()
 
 void ListModel::emit_data_changed(int index, int count, const std::vector<int>& roles)
 {
-  do_update(index, count, QVector<int>::fromStdVector(roles));
+  do_update(index, count, QVector<int>(roles.begin(), roles.end()));
 }
 
 void ListModel::do_update(int index, int count, const QVector<int> &roles)