Improved code complexity of Domain's FindPlan and Planner's Tick.

[ptrefall]

Improved Method Complexity

Description

I decided to break up FindPlan of Domain and Tick of Planner into smaller functions, to ease the complexity a bit. Hopefully should make the code easier to follow and make it easier to make custom modifications too.

Type of change

• [x] Code cleanup

How Has This Been Tested?

• [x] All unit tests still pass

Checklist:

• [x] My code follows the style guidelines of this project
• [x] I have performed a self-review of my own code
• [x] I have commented my code, particularly in hard-to-understand areas
• [ ] I have made corresponding changes to the documentation
• [x] My changes generate no new warnings
• [ ] I have added tests that prove my fix is effective or that my feature works
• [x] New and existing unit tests pass locally with my changes
• [ ] Any dependent changes have been merged and published in downstream modules