[dictgen] Also forward declare namespaces, typedefs, enums:

[Axel-Naumann]

They were picked up as side effects of classes, but not forward declared as
and by themselves. This fixes namespaces and enums not being available / known at the ROOT prompt despite their dictionary being loaded:
https://root-forum.cern.ch/t/enum-in-namespace-not-available-after-loading-dictionary/45757

[phsft-bot]

Starting build on ROOT-debian10-i386/cxx14, ROOT-performance-centos8-multicore/default, ROOT-ubuntu16/nortcxxmod, mac1014/python3, mac11.0/cxx17, windows10/cxx14
How to customize builds

[phsft-bot]

Starting build on ROOT-debian10-i386/cxx14, ROOT-performance-centos8-multicore/default, ROOT-ubuntu16/nortcxxmod, mac1014/python3, mac11.0/cxx17, windows10/cxx14
How to customize builds

[phsft-bot]

Build failed on ROOT-ubuntu16/nortcxxmod.
Running on sft-ubuntu-1604-2.cern.ch:/build/workspace/root-pullrequests-build
See console output.

Failing tests:

• projectroot.test.test_stressmathmore_interpreted
• projectroot.test.test_stressroofit_interpreted
• projectroot.test.test_stressHistFactory_interpreted
• projectroot.test.test_stressroostats_interpreted
• projectroot.test.test_stresshistofit_interpreted
• projectroot.test.test_stressmathcore_interpreted
• projectroot.test.test_stressgraphics_interpreted
• projectroot.test.test_stresshistogram_interpreted
• projectroot.bindings.pyroot.pythonizations.test.pyunittests_pyroot_roofit_rooabsreal_ploton
• projectroot.bindings.pyroot.pythonizations.test.pyunittests_pyroot_roofit_rooabspdf_fitto

And 78 more

[phsft-bot]

Build failed on ROOT-performance-centos8-multicore/default.
Running on olbdw-01.cern.ch:/data/sftnight/workspace/root-pullrequests-build
See console output.

Failing tests:

• projectroot.roottest.root.io.newClassDef.roottest_root_io_newClassDef_make
• projectroot.roottest.root.meta.enums.roottest_root_meta_enums_enumsInNamespaces
• projectroot.roottest.root.meta.enums.roottest_root_meta_enums_duplicateEnums
• projectroot.roottest.root.meta.enums.roottest_root_meta_enums_enumsInNamespaces2
• projectroot.roottest.root.meta.enums.roottest_root_meta_enums_execEnumsTest

[phsft-bot]

Build failed on mac1014/python3.
Running on macphsft17.dyndns.cern.ch:/build/jenkins/workspace/root-pullrequests-build
See console output.

Failing tests:

• projectroot.roottest.root.meta.enums.roottest_root_meta_enums_enumsInNamespaces
• projectroot.roottest.root.meta.enums.roottest_root_meta_enums_duplicateEnums
• projectroot.roottest.root.meta.enums.roottest_root_meta_enums_enumsInNamespaces2
• projectroot.roottest.root.meta.enums.roottest_root_meta_enums_execEnumsTest

[phsft-bot]

Build failed on mac11.0/cxx17.
Running on macphsft23.dyndns.cern.ch:/Users/sftnight/build/workspace/root-pullrequests-build
See console output.

Failing tests:

• projectroot.roottest.root.io.newClassDef.roottest_root_io_newClassDef_make
• projectroot.roottest.root.meta.enums.roottest_root_meta_enums_execEnumsTest
• projectroot.roottest.root.meta.enums.roottest_root_meta_enums_enumsInNamespaces
• projectroot.roottest.root.meta.enums.roottest_root_meta_enums_enumsInNamespaces2
• projectroot.roottest.root.meta.enums.roottest_root_meta_enums_duplicateEnums

[phsft-bot]

Build failed on ROOT-debian10-i386/cxx14.
Running on pcepsft10.dyndns.cern.ch:/build/workspace/root-pullrequests-build
See console output.

Errors:

• [2021-07-13T15:46:23.191Z] stderr: error: could not read '.git/rebase-apply/head-name': No such file or directory

Failing tests:

• projectroot.roottest.python.cpp.roottest_python_cpp_cpp
• projectroot.roottest.root.meta.enums.roottest_root_meta_enums_execEnumsTest
• projectroot.roottest.root.meta.enums.roottest_root_meta_enums_enumsInNamespaces
• projectroot.roottest.root.meta.enums.roottest_root_meta_enums_duplicateEnums
• projectroot.roottest.root.meta.enums.roottest_root_meta_enums_enumsInNamespaces2

[phsft-bot]

Build failed on windows10/cxx14.
Running on null:C:\build\workspace\root-pullrequests-build
See console output.

Failing tests:

• projectroot.roottest.root.meta.enums.roottest_root_meta_enums_enumsInNamespaces
• projectroot.roottest.root.meta.enums.roottest_root_meta_enums_duplicateEnums
• projectroot.roottest.root.meta.enums.roottest_root_meta_enums_enumsInNamespaces2
• projectroot.roottest.root.meta.enums.roottest_root_meta_enums_execEnumsTest

[dpiparo]

Restarted all tests to see how we are performing...

[github-actions]

Test Results

    13 files      13 suites   2d 20h 31m 10s ⏱️
 2 648 tests  2 342 ✅ 0 💤 306 ❌
32 608 runs  31 946 ✅ 0 💤 662 ❌

For more details on these failures, see this check.

Results for commit 22a84ec.