use a hack to allow drawing a single string on top of everything else

hack was necessary because `Drop` tyes are currently not allowed in statics.
see rust-lang/rust#33156

Signed-off-by: Ryan1729 <Ryan1729@gmail.com>

Author: Ryan1729

common/src/lib.rs

@@ -2,16 +2,16 @@ extern crate rand;
 
 use rand::{StdRng, Rng};
 
-pub fn random_string(rng : &mut StdRng) -> String {
-    rng.gen_ascii_chars()
-        .take(6).collect()
+pub fn random_string(rng: &mut StdRng) -> String {
+    rng.gen_ascii_chars().take(6).collect()
 }
 
 pub struct Platform {
     pub draw_poly: fn(f32, f32, usize),
     pub draw_poly_with_matrix: fn([f32; 16], usize),
     pub draw_textured_poly: fn(f32, f32, usize, i32),
     pub draw_textured_poly_with_matrix: fn([f32; 16], usize, i32),
+    pub draw_text: fn(&str, (f32, f32), f32, f32),
     pub set_verts: fn(Vec<Vec<f32>>),
 }