Track/follow rename to `indirect`.

[martinmoene]

See PR 119 of J.B. Coe's indirect(_value) reference implementation.

Progress:

• Rename repository to indirect-lite.
• Rename include file to ./include/nonstd/indirect.hpp.
• Rename tweak include file to ./test/nonstd/indirect.tweak.hpp.
• Rename ./cmake/indirect-value-* to ./cmake/indirect-*
• In test folder, rename files to *indirect*.
• Fixup includes in ./example folder.
• Fixup includes in ./test folder.
• Fixup batch files in ./test folder.
• Fixup ./script/update-version.py for paths.
• Fixup ./CMakeLists.txt.
• Fixup ./example/CMakeLists.txt.
• Fixup ./test/CMakeLists.txt.
• In header, test source, CMakeLists.txt, rename INDIRECT_VALUE to INDIRECT in macros.
• In header, rename indirect_value_lite to indirect_lite in macros; also in indirect-main.t.cpp.
• Fixup ./script/update-version.py for version macros.
• In header, rename class indirect_value to indirect.
• In test program, rename class indirect_value to indirect.
• Update Readme.
• ...
• Update list of projects in Readme of nonstd lite.