QmlDesigner: improve terminology consistency

- Removed secondary name "QML Emulation Layer," which was introduced
  to hide the term "QML Puppet" from normal users
- "QML Puppet" settings are nowadays hidden from normal users anyway
- Added crash info indicating it is an internal process; this is the
  only location where "QML Puppet" is exposed to normal users
- Removed outdated CMake comments

Task-number: QDS-13345
Change-Id: Idb8b909580269a8396842f1cc4ad056649075d01
Reviewed-by: Thomas Hartmann <thomas.hartmann@qt.io>
Reviewed-by: Miikka Heikkinen <miikka.heikkinen@qt.io>

scripts/deploy.py

@@ -405,7 +405,7 @@ def deploy_qt_mac(qtc_binary_path, qt_install):
     for app in apps:
         additional_paths.append(os.path.join(bin_path, app))
     additional_paths.append(os.path.join(libexec_path, 'qbs_processlauncher'))
-    # qml2puppet
+    # QML Puppet
     puppets = glob(os.path.join(libexec_path, 'qmlpuppet*'))
     for puppet in puppets:
         additional_paths.append(puppet)