buildsystem - namespace CMake options

OPTION_DEVELOPER_MODE => KDDockWidgets_DEVELOPER_MODE
OPTION_BUILD_PYTHON_BINDINGS => KDDockWidgets_PYTHON_BINDINGS
PYTHON_BINDINGS_INSTALL_PREFIX =>
  KDDockWidgets_PYTHON_BINDINGS_INSTALL_PREFIX
OPTION_QTQUICK => KDDockWidgets_QTQUICK

.vscode/settings.json

@@ -4,7 +4,7 @@
         "qevent": "cpp"
     },
     "cmake.configureSettings": {
-        "OPTION_DEVELOPER_MODE" : "ON",
-        "OPTION_QTQUICK" : true
+        "KDDockWidgets_DEVELOPER_MODE" : "ON",
+        "KDDockWidgets_QTQUICK" : true
     }
 }