feat(UI): New run/crouch icons

[thedyze]

Checklist

Required

• I wrote the PR title in conventional commit format.
• I ran the code formatter.
• I linked any relevant issues using github keyword syntax so it can be closed automatically.
• I have committed my changes to new branch that isn't main so it won't cause conflict when updating main branch later.

Optional

• I have documented the changes in the appropriate location in the doc/ folder.

Purpose of change

Current icons for run and crouch are almost as large as the player. The crouch icon doesn't very clearly communicate crouch.

Describe the solution

This change adds new, smaller and simplified icons for crouch and sprint.

[Zireael07]

Why close?

[RoyalFox2140]

#5674
https://discord.com/channels/830879262763909202/830916451517857894/1304995310044713050

[thedyze]

Why close?

See mention above :)