Remove PhantomData usage. PhantomData is used through the library to substitute associated constants (to types). However, calling `PamItem::item_type(PhantomData<T>)` can easily be substituted by calling `T::item_type()`, getting rid of the need for PhantomData.

# Compiled files
*.o
*.so
*.rlib
*.dll

# Executables
*.exe

# Generated by Cargo
/target/
Cargo.lock

# Override top-level .gitignore in Misc repo
!src/tozny