Add developer tools for livescripts

[ehennestad]

Motivation

• Make it easier to update live script documentation (html files)
• Make it easier to view changes to live scripts with git diff
• Use pre-commit hook to ensure html documentation is up-to-date on commit

Changes

• Adds an m-file corresponding to each live script in a private folder
• Add pre-commit hook to check if html documentation is up-to-date on commits
• Add convenience functions in the tools folder

How to test the behavior?

This PR is only relevant for developers. It adds the following convenience functions to the tools folder:

• matnwb_exportModifiedTutorials - Run and export each live script that have been modified
• matnwb_generateDocs - Generate html documentation for matnwb api functions
• matnwb_installm2html - Install dependency needed for above function
• matnwb_installGitHooks - Install git hooks (currently only pre-commit)
• matnwb_setup - Setup script for developers

Checklist

• [x] Have you ensured the PR description clearly describes the problem and solutions?
• [x] Have you checked to ensure that there aren't other open or previously closed Pull Requests for the same change?
• [x] If this PR fixes an issue, is the first line of the PR description fix #XX where XX is the issue number?

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 95.16%. Comparing base (fa04ab0) to head (87b93a0). Report is 1 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #626 +/- ## ======================================= Coverage 95.16% 95.16% ======================================= Files 113 113 Lines 4734 4734 ======================================= Hits 4505 4505 Misses 229 229 ```

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