build: CMake bugfixes

Fixes include:
- Handling of relative paths used as output directories
- Accepting comma separated lists of modules to enable/disable
- Echoing all CMake commands at the end of the execution of ns3 script
- More informative optional features summary output
- Replace absolute paths with relative paths in the printed CMake output for less verbose output
- Set debug build type on the CMake side to ensure ccmake doesn't crash
- Prefix INT64X64 with NS3 to indicate user switch
- Compiler version check
- Removal of verbose option
- Suppress empty enabled/disabled module tables

Features include:
- Test for installation/uninstallation of ns-3 as a CMake package
- Test importing ns-3 as a CMake package and use in a 3rd-party project
- Test to check VERSION usage
- ns3 option to enable/disable sanitizers
- Associate headers to libraries targets

utils/create-module.py

@@ -29,7 +29,7 @@ set(libraries_to_link
     ${{libcore}}
     )
 
-if(${{EXAMPLES_ENABLED}})
+if(${{ENABLE_EXAMPLES}})
     set(examples_as_tests_sources    
         #test/{MODULE}-examples-test-suite.cc
         )