[Speed] Adjustments to calculations and modifiers

[Xaver-DaRed]

I affirm:

• I understand that if I do not agree to the following points by completing the checkboxes my PR will be ignored.
• I understand I should leave resolving conversations to the LandSandBoat team so that reviewers won't miss what was said.
• I have read and understood the Contributing Guide and the Code of Conduct.
• I have tested my code and the things my code has changed since the last commit in the PR and will test after any later commits.

What does this pull request do?

Uses info gathered by COCONUTS Cocosolos to adjust speed calculations.

• Makes gear penalties and mazurka/quickening additive to base speed, pre-multipliers
• Adjusts additive modifiers to use a flat number to easily add to base speed.
• Discovered a ridiculously small cap for mazurka and quickening combined, meaning they are indeed additive among them.

In short, gear that boosts your speed was unafected, flee is its own multiplier now and gear with penalties + quickening/mazurka are added before the multipliers are applied

Steps to test these changes

Just use gear and speed-altering stuff while walking

[cocosolos]

Looks good!

[cocosolos]

Small mistake on my part, Bolter's roll actually goes between cheer and gear. Otherwise everything else looks right.