allow inlining (this did not provide a statistically significant performance boost - oh well)

src/room.rs

@@ -15,10 +15,12 @@ pub struct Room {
 }
 
 impl Room {
+    #[inline]
     fn name_line(&self) -> String {
         optional_data_line("NAME", self.name.as_ref())
     }
 
+    #[inline]
     fn wall_line(&self) -> String {
         if self.walls.len() > 0 {
             let ids: Vec<String> = self.walls.iter().map(|&id| id.to_base36()).collect();
@@ -28,6 +30,7 @@ impl Room {
         }
     }
 
+    #[inline]
     fn palette_line(&self) -> String {
         if self.palette_id.is_some() {
             optional_data_line("PAL", Some(self.palette_id.unwrap().to_base36()))
@@ -38,6 +41,7 @@ impl Room {
 }
 
 impl From<String> for Room {
+    #[inline]
     fn from(string: String) -> Room {
         let string = string.replace("ROOM ", "");
         let string = string.replace("SET ", "");
@@ -141,6 +145,7 @@ impl From<String> for Room {
 }
 
 impl Room {
+    #[inline]
     pub fn to_string(&self, room_format: RoomFormat, room_type: RoomType) -> String {
         let mut tiles = String::new();
         let mut items = String::new();