add aliases so the OneDReader proc macro compiles

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.

src/rxing_result_point.rs

@@ -19,6 +19,9 @@ pub struct Point {
     pub(crate) y: f32,
 }
 
+/** Currently necessary because the external OneDReader proc macro uses it. */
+pub type RXingResultPoint = Point;
+
 impl Hash for Point {
     fn hash<H: std::hash::Hasher>(&self, state: &mut H) {
         self.x.to_string().hash(state);