Very old rust code requires update

[tavurth]

This crate is very old, and I was unable to bring it up to date.

I fixed 24 out of the 26 errors, however the issues I'm facing now are the following:

impl<'a, T: Bounded> Mutable for QuadTree<'a, T> { ... }
impl<'a, T: Bounded> Container for QuadTree<'a, T> { ... }

I'm not sure yet how to transform this to new rust code, any ideas?

[oovm]

Some features are out of date, can we upgrade this package to 2018