Constraints refactor

[SwissalpS]

This commit changes:

• adds replacer.permit_replace() overridable function so that servers can fine tune where, when and who can replace what that can't be done with other provided limiters (Fixes: https://github.com/SwissalpS/replacer/issues/21 for those who don't want to use custom protection mod and still think callback is a good idea: https://github.com/Sokomine/replacer/issues/6)
• adds replacer.register_exception() to allow special nodes that don't rotate with param2, like cable plates. These are also already added by default if technic mod is being used
• changes that give priv does not also grant modes only creative does
• changes a lot in how nodes are searched and how their amount is limited. On one hand much nicer holes/buildups on the other less per click when clicking on 'infinite' planes (adjusted version of https://github.com/SwissalpS/replacer/pull/20)

Reviewers please test in general and especially if we need to change the default parameters for search and replace variables. @S-S-X @OgelGames @BuckarooBanzai @coil0 @6r1d