Previously, the struct was passed around everywhere as a
reference. It only holds two floats, so there's no real
need for indirection. Now it's being passed as a value.

Build fails because the OneDReader proc macro expects
that a RXingResultPoint type exists.

Currently it's not possible to rename RXingResultPoint
to Point cleanly, since the external OneDReader proc macro
makes use of them. For the time being, simple aliases
are introduced to get the code to compile, but the plan
is to remove them at a later point.

Shorter than writing `Point::new`

Point already has `x` and `y` properties, so accessing
them with `getX()` and `getY()` is needlessly verbose.
These calls have been removed, though the trait impl is
still presen for the time being, since the OneDReader
proc macro requires it.