Resolve "PluginElements: particles not recorded when element crosses (or close to) origin"

What does this MR do?

• fix #313 (closed) (plugin elements in multiple quadrants), by calculating the radius closest to the origin per plugin element (rmin_m).
• refactor and force more structure to PluginElement::Check(). This is work towards unifying the geometry check of all plugin elements.
• reduce duplication and several other improvements (see Discussion).

Does this MR meet the acceptance criteria?

• Coding style guidelines
• Change to Release Notes

Bug