Cleanup the FieldVector<K,SIZE>

Simon Praetoriusrequested to merge
issue/fieldvector-constructors into master

This MR cleans up the FieldVector class similar to the cleanup of just the specialization FieldVector<K,1> in !1387 (merged).

The following changes are implemented

  • Unify the indentation and spaces inside brackets, around brackets, and around for, if statements.
  • Add constexpr to all functions where possible
  • Add noexcept keyword where possible (sometimes with a condition)
  • Unify the formatting of documentation comments
  • Simplify the constraints on the constructors, without changing its behavior
  • Cleanup of includes (remove unnecessary includes, order lexicographically, write out full path)
  • Rename the include-guard to common form

This MR also contains a change discussed and implemented in !1345 (merged), which should be merged before.

Edited by Simon Praetorius

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