fix: add Create module to CMake build

The Create module (src/Mod/Create/) was never included in the build
because src/Mod/CMakeLists.txt did not call add_subdirectory(Create).

This meant:
- Mod/Create/InitGui.py was never installed, so the workbench loader
  (setup_kindred_workbenches) that loads silo and ztools never ran
- The install rules for mods/silo/freecad/ and mods/silo/silo-client/
  never executed, leaving the silo workbench files missing
- kc_format.py was also not listed in the Create install rule

Fixes the 'Ignoring unknown SiloWorkbench' error on startup.

src/Mod/CMakeLists.txt

@@ -143,3 +143,5 @@ endif(BUILD_TUX)
 if(BUILD_WEB)
     add_subdirectory(Web)
 endif(BUILD_WEB)
+
+add_subdirectory(Create)

src/Mod/Create/CMakeLists.txt

@@ -13,6 +13,7 @@ install(
     FILES
         Init.py
         InitGui.py
+        kc_format.py
         update_checker.py
         ${CMAKE_CURRENT_BINARY_DIR}/version.py
     DESTINATION