Add support of per-file configuration `buildaction "None"`

[Jarod42]

What does this PR do?

Add support of per-file configuration buildaction "None" for Codelite, gmake, gmake2, xcode4.

How does this PR change Premake's behavior?

As for flags "ExcludeFromBuild", previously conflicting obj file name might now differ (as there are no longer built): i.e

files {"src/toto.cpp", "excluded/toto.cpp" }
filters {"files:excluded/toto.cpp"}
    buildaction "None"

Both resulted in "toto.o" with special treatment now "excluded/toto.cpp" won't have obj object, and so no conflict with the "src/" one.

Anything else we should know?

Tested with my repo especially:

• codelite action
• gmake action
• gmake2 action
• xcode4 action

Did you check all the boxes?

• [x] Focus on a single fix or feature; remove any unrelated formatting or code changes
• [x] Add unit tests showing fix or feature works; all tests pass
• [ ] Mention any related issues (put closes #XXXX in comment to auto-close issue when PR is merged)
• [x] Follow our coding conventions
• [x] Minimize the number of commits
• [ ] Align documentation to your changes