Re-instate mapclientplugins hook for PyInstaller.

Author: hsorby

res/pyinstaller/hooks/hook-mapclientplugins.py

@@ -0,0 +1,5 @@
+from PyInstaller.utils.hooks import collect_submodules
+
+
+# I don't think this will work if the plugin is zipped in an archive.
+hiddenimports = collect_submodules('mapclientplugins')