[Keyboard] Refactor Helix

[waffle87]

Description

• Removes legacy code such as define's
• Removes unnecessary and complicated makefiles
• Adds keyboard level code that is used across revisions (keycodes and OLED behaviour)
• Formatting on lots of files

Types of Changes

• [ ] Core
• [ ] Bugfix
• [ ] New feature
• [ ] Enhancement/optimization
• [x] Keyboard (addition or update)
• [x] Keymap/layout/userspace (addition or update)
• [ ] Documentation

Checklist

• [x] My code follows the code style of this project: C, Python
• [x] I have read the PR Checklist document and have made the appropriate changes.
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [x] I have read the CONTRIBUTING document.
• [ ] I have added tests to cover my changes.
• [x] I have tested the changes and verified that they work and don't break anything (as well as I can manage).

[dunk2k]

I do like a good optimisation 😊

Could I be a cheeky (so and so) and ask for the following amendments:

1. image URL in keyboards/helix/readme.md have the added h before .jpg?
2. glcdfont.c is missing licence information in header, could it be added?

[tzarc]

Probably want @mtei to chime in on this one.

[tzarc]

As of August 26, 2024, qmk/qmk_firmware is no longer accepting VIA-enabled keymaps as these have now transitioned to a repository under the VIA team's control.

As you've submitted a PR containing via or VIA-enabled keymap(s), this is your notice that they should be removed from this PR. You should now submit a secondary PR to the VIA QMK Userspace repository with your associated via or VIA-enabled keymaps instead.