Removed obsolete RangeTree code
With version 3.0.0 we now remove the obsolete RangeTree code to get a clean slate and have all classes be called IntervalTree. The only place, where RangeTree still appears is the package name and the git repository (which can't be changed, unless we create a completely new package).
Make sure to upgrade to 2.1.0 first and fix all compiler warnings, before upgrading to 3.0.0.
If you haven't used this project before, directly jump to this version.