Lightweight project features/interface to behave like snippets

• Users want versioned snippets. https://gitlab.com/gitlab-org/gitlab-ce/issues/13426.
• They want to be able to have code tracking for auditing reasons.
• But they also want the lightweight UI and use of snippets.
• Currently snippets are not versioned.
• Instead of introducing Git versioning to snippets, can we instead make our project features more lightweight to achieve the same result?
• Improving commenting features for file browser.
• Improved system note support in file browser.
• Improved Web IDE integration into file browser.
• Each file in a project/repo would be equivalent to a snippet.