Documentation - Migration to CMake from TCL #441

Remove OS folder with structure for refman generation.
Remove tcl scripts from adm folder which used only for doc generation
Migrate all the processes of doc generation to cmake (adm/cmake/occt_doc.cmake)
RefMan and Overview build from CMake as a new utility option, no TCL is needed.

CMakeLists.txt

@@ -225,6 +225,15 @@ if (NOT DEFINED BUILD_DOC_Overview)
   set (BUILD_DOC_Overview OFF CACHE BOOL "${BUILD_DOC_Overview_DESCR}")
 endif()
 
+# Reference Manual
+if (NOT DEFINED BUILD_DOC_RefMan)
+  set (BUILD_DOC_RefMan OFF CACHE BOOL "${BUILD_DOC_RefMan_DESCR}")
+endif()
+
+if (NOT DEFINED INSTALL_DOC_RefMan)
+  set (INSTALL_DOC_RefMan OFF CACHE BOOL "${INSTALL_DOC_RefMan_DESCR}")
+endif()
+
 if (CMAKE_VERSION VERSION_LESS "3.14")
   OCCT_CHECK_AND_UNSET (BUILD_INCLUDE_SYMLINK)
 endif()
@@ -702,7 +711,7 @@ else()
 endif()
 
 # Doxygen
-if (BUILD_DOC_Overview)
+if (BUILD_DOC_Overview OR BUILD_DOC_RefMan)
   if (NOT DEFINED INSTALL_DOC_Overview)
     set (INSTALL_DOC_Overview OFF CACHE BOOL "${INSTALL_DOC_Overview_DESCR}")
   endif()
@@ -710,7 +719,7 @@ if (BUILD_DOC_Overview)
   list (APPEND OCCT_3RDPARTY_CMAKE_LIST "adm/cmake/doxygen")
 else()
   OCCT_CHECK_AND_UNSET ("INSTALL_DOC_Overview")
-
+  OCCT_CHECK_AND_UNSET ("INSTALL_DOC_RefMan")
   OCCT_CHECK_AND_UNSET ("3RDPARTY_DOXYGEN_EXECUTABLE")
   OCCT_CHECK_AND_UNSET ("3RDPARTY_DOT_EXECUTABLE")
 endif()
@@ -1175,7 +1184,9 @@ foreach (BUILD_TOOLKIT ${BUILD_TOOLKITS})
 endforeach()
 
 if (BUILD_DOC_Overview)
-  OCCT_ADD_SUBDIRECTORY (dox)
+  OCCT_INCLUDE_CMAKE_FILE ("adm/cmake/occt_doc")
+  # Setup documentation targets
+  OCCT_SETUP_DOC_TARGETS()
 endif()
 
 # patch DRAWEXE