Add new velocity patterns and optimise old ones

[subvertnormality]

What does this PR do?

Adds new velocity helper patterns and optimises the old ones.

Provide links to any related discussion on lines.

N/A

How should this be manually tested?

Test the new patterns (10-19). DR.V 19 0

Any background context you want to provide?

N/A

If the related Github issues aren't referenced in your commits, please link to them here.

N/A

I have,

• [/] updated CHANGELOG.md and whats_new.md
• [/] updated the documentation
• [/] updated help_mode.c (if applicable)
• [/] run make format on each commit
• [/] run tests