Sidedef Reader

Added the ability to read sidedef lumps from the wadfile.

src/lumps/sidedef.rs

@@ -0,0 +1,19 @@
+use crate::types::Sidedef;
+
+pub struct SidedefLump {
+    pub sidedefs: Vec<Sidedef>,
+}
+
+impl SidedefLump {
+    pub fn get_num_sidedefs(&self) -> usize {
+        self.sidedefs.len()
+    }
+
+    pub fn get_all_sidedefs(&self) -> Vec<Sidedef> {
+        self.sidedefs.to_vec()
+    }
+
+    pub fn get_sidedef(&self, pos: usize) -> Sidedef {
+        self.sidedefs[pos].to_owned()
+    }
+}