distant detector patch

[zyxkad]

• add volatile keyword to DistanceDetector fields
• fix distance detector max distance behaviour
• fix double float convert
• Persistence distance detector settings

PLEASE READ THE GUIDELINES BEFORE MAKING A CONTRIBUTION

• Please check if the PR fulfills these requirements

• The commit message are well described
• Docs have been added / updated (for features or maybe bugs which were noted). If not, please update the needed documentation here. Feel free to remove this check if you don't need it
• All changes have fully been tested

• What kind of change does this PR introduce? (Bug fix, feature, ...)
  Bug fix, feature

• What is the current behavior? (You can also link to an open issue here)
  Distant detector does not return exact distance the entity/block model has

• What is the new behavior (if this is a feature change)?
  Use volatile/atomic to ensure fields can be safely share between threads
  Make block hit & entity hit check more accurate
  Persistence distance detector settings

• Does this PR introduce a breaking change? (What changes might users need to make in their scripts due to this PR?)
  No

• Other information:

[SirEndii]

The cleanup and changes look good, the thing really needed some love