Refactor EngravingRules: remove getters and setters, make properties public (#841) (#862)

squashed commits:

* refactor: eliminate getter and setter in engraving rules

* Fixed error

* refactor: revert some accidental variable renamings

these were mostly accidentally suggested during a conference code review by myself (except Height/Width)

* refactor: revert final accidental renamings

the renaming of PageFormat.width to Width wasn't necessary and may affect other code bases
(same for height/idstring)

* refactor

missed Height in last commit/refactor

Co-authored-by: anita2822 <68724826+anita2822@users.noreply.github.com>
Co-authored-by: sschmid <s.schmid@phonicscore.com>