PERF: Remove redundant CMake variables.

ITK_BUILD_ALL_MODULES_DEFAULT  and BUILD_EXAMPLES_DEFAULT
are redundant since the default setting for both the
developers and the dashboard is the same.

Cleaning up those variables makes the cmake code
more readable.

Change-Id: I12e9f5d6975e143227930825158b536e1bf4aaa3
DOC: Sort the module enabling messages by names.

Making it easier to check for a specific module.

Change-Id: I16105f851c7c3c821a38d4ce236a0e6146455a90
Merge topic 'DeprecateITK_BUILD_ALL_MODULES'

61bdc4c DOC: Sort the module enabling messages by names.
9b381b2 PERF: Remove redundant CMake variables.