implement level completion, score storing and a dismissable 'level complete' popup

src/marble_engine/board.rs

@@ -63,10 +63,10 @@ impl Board {
 		Board::new(rows)
 	}
 
-	pub fn to_string(&self)->String{
+	pub fn to_string(&self) -> String {
 		let mut out = String::new();
-		for row in &self.rows{
-			for tile in row{
+		for row in &self.rows {
+			for tile in row {
 				out.push(tile.to_char())
 			}
 			out.push('\n');
@@ -91,6 +91,19 @@ impl Board {
 		}
 	}
 
+	pub fn count_tiles(&self) -> usize {
+		let mut sum = 0;
+		for row in &self.rows {
+			for tile in row {
+				match tile {
+					Tile::Blank | Tile::Block => (),
+					_ => sum += 1,
+				}
+			}
+		}
+		sum
+	}
+
 	pub fn in_bounds(&self, p: Pos) -> bool {
 		p.x >= 0 && p.y >= 0 && p.x < self.width as isize && p.y < self.height as isize
 	}