v3 Clean up maps, tests

[lrljoe]

• Add additional Lifecycle Hook by @lrljoe in V3 move render methods to trait #1534
  • SettingColumns/ColumnsSet
• Migrate methods for pre-render out of render by @lrljoe in V3 move render methods to trait #1534
• Update tests to reflect hooks by @lrljoe in V3 move render methods to trait #1534
• Update tests to add invalid string tests for dates by @lrljoe in V3 move render methods to trait #1534
• Remove maps and minimise functions from FrontendAssets by @lrljoe in V3 move render methods to trait #1534

All Submissions:

• Have you followed the guidelines in our Contributing document?
• Have you checked to ensure there aren't other open Pull Requests for the same update/change?

New Feature Submissions:

1. Does your submission pass tests and did you add any new tests needed for your feature?
2. Did you update all templates (if applicable)?
3. Did you add the relevant documentation (if applicable)?
4. Did you test locally to make sure your feature works as intended?

Changes to Core Features:

• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you written new tests for your core changes, as applicable?
• Have you successfully ran tests with your changes locally?

[codecov]

Codecov Report

Merging #1536 (642b435) into develop (3a3b42c) will increase coverage by 0.18%.
The diff coverage is n/a.

@@              Coverage Diff              @@
##             develop    #1536      +/-   ##
=============================================
+ Coverage      88.80%   88.98%   +0.18%     
+ Complexity      1266     1264       -2     
=============================================
  Files             96       96              
  Lines           3001     2997       -4     
=============================================
+ Hits            2665     2667       +2     
+ Misses           336      330       -6     

Files	Coverage Δ
src/Mechanisms/RappasoftFrontendAssets.php	100.00% <ø> (+6.77%)	⬆️

... and 2 files with indirect coverage changes