PR4: Add helpmenu option

[shrivaths16]

Description

Add help menu option to display the announcement manually as well. This is the 4th PR that solves the issuev #1563

Types of changes

• [ ] Bugfix
• [ ] New feature
• [ ] Refactor / Code style update (no logical changes)
• [ ] Build / CI changes
• [ ] Documentation Update
• [ ] Other (explain)

Does this address any currently open issues?

• 1563

Outside contributors checklist

• [ ] Review the guidelines for contributing to this repository
• [ ] Read and sign the CLA and add yourself to the authors list
• [ ] Make sure you are making a pull request against the develop branch (not main). Also you should start your branch off develop
• [ ] Add tests that prove your fix is effective or that your feature works
• [ ] Add necessary documentation (if appropriate)

Thank you for contributing to SLEAP!

:heart:

Summary by CodeRabbit

• New Features

  • Added new actions "Announcements" and "What's New?" to the help menu.
  • Implemented functionality to open the latest bulletin.
  • Added a new entry for "Lili Karashchuk" to the AUTHORS file.

• Bug Fixes

  • Modified logic for handling animal tracks and instances in deeplabcut.py.
  • Adjusted the encoding and storage of video frames in the HDF5 file in sleap/io/video.py.

• Tests

  • Modified logic of the test case test_import_labels_from_dlc_folder in test_commands.py.
  • Added a new test case test_maudlc in test_commands.py.

[coderabbitai[bot]]

Walkthrough

The recent changes enhance the SLEAP application's user interface by adding new help menu options that provide announcements and updates. The backend logic now supports these features along with improved track handling in DeepLabCut file processing. The AUTHORS file is updated with a new contributor, and the video encoding process for HDF5 storage has been refined. Testing has been updated to reflect these new functionalities and expected behaviors.

Changes

File Path	Change Summary
sleap/gui/app.py, sleap/gui/commands.py	Modified new_instance_menu_action to add "Announcements" and "What's New?" actions to the help menu. Added a separator to the help menu. Added showBulletin method and reorganized code in several classes. Extensively modified AddInstance class.
AUTHORS	Added new author Lili Karashchuk.
sleap/io/format/deeplabcut.py	Added imports, implemented new track handling logic, and added missing video file handling.
sleap/io/video.py	Modified to_hdf5 function for frame encoding in HDF5 storage.
sleap/nn/system.py	Adjusted GPU "Initialized" status output formatting.
tests/gui/test_commands.py	Updated a test case and added a new one for MA-DLC processing.

Poem

🐇 "In the code where we hop,
🌟 New features now pop,
📚 Help menus expand, tracks align,
🎉 A SLEAP forward, in code we entwine."

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[codecov[bot]]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (b5d5139) 73.46% compared to head (4b51812) 73.46%.

Files	Patch %	Lines
sleap/gui/commands.py	66.66%	2 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## shrivaths/changelog-announcement-3 #1628 +/- ## =================================================================== Coverage 73.46% 73.46% =================================================================== Files 135 135 Lines 24131 24139 +8 =================================================================== + Hits 17728 17734 +6 - Misses 6403 6405 +2 ```

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