Swap file and rank in Position

Because the chess positions read as "file-rank"

rs/src/board.rs

@@ -29,15 +29,15 @@ impl Color {
 
 #[derive(PartialEq, Eq, Hash, Clone)]
 pub struct Position {
-    pub rank: Rank,
     pub file: File,
+    pub rank: Rank,
 }
 
 impl Position {
-    pub fn new(rank: Rank, file: File) -> Position {
+    pub fn new(file: File, rank: Rank) -> Position {
         Position {
-            rank,
             file,
+            rank,
         }
     }
     fn delta(
@@ -190,7 +190,7 @@ impl PieceType {
                                 piece_type: self.clone(),
                                 color: color.clone(),
                             },
-                            Position::new(color.get_pawn_rank(), file),
+                            Position::new(file, color.get_pawn_rank()),
                         )
                     })
                 })

rs/src/ui.rs

@@ -103,7 +103,7 @@ impl board::Position {
         let file = board::File::parse(chars.next().ok_or(())?)?;
         let rank = board::Rank::parse(chars.next().ok_or(())?)?;
         if chars.next().is_none() {
-            Ok(board::Position::new(rank, file))
+            Ok(board::Position::new(file, rank))
         } else {
             Err(())
         }