[Keyboard] Add FL-Esports FL980 to sn32_develop

[iglooom]

Description

FL-Esports FL980 3-mode keyboard MCU: SN32F248BF

Added keymaps and VIA config. Used RGB matrix driver from @dexter93 suggested in #302 with some tweaks to support NPN in columns.

Types of Changes

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

[dexter93]

sn32_develop has been updated with latest changes mentioned here. Please rebase

[iglooom]

@dexter93 updated

[iglooom]

I've used this version for 2 weeks, seems all okay.

[dexter93]

Please add some licence headers to please the linter

linting flesports/fl980
☒ flesports/fl980: The file "keyboards/flesports/fl980/fl980.h" does not have a license header!
☒ flesports/fl980/via: The file "keyboards/flesports/fl980/keymaps/via/config.h" does not have a license header!
☒ Lint check failed for: flesports/fl980

will merge after it passes

[iglooom]

Fixed