enter and exit solution editor

src/marble_engine/board.rs

@@ -63,6 +63,17 @@ impl Board {
 		Board::new(rows)
 	}
 
+	pub fn to_string(&self)->String{
+		let mut out = String::new();
+		for row in &self.rows{
+			for tile in row{
+				out.push(tile.to_char())
+			}
+			out.push('\n');
+		}
+		out
+	}
+
 	pub fn new_empty(width: usize, height: usize) -> Self {
 		let rows = vec![vec![Tile::Blank; width]; height];
 		Self {