made significant upgrades to the rendering API. now need to move all applications to the new API and deprecate the old one.

src/system/kernel/render.rs

@@ -296,6 +296,7 @@ impl Renderer {
         if self.application_mode {
             for (i, row) in self.app_buffer.iter().enumerate() {
                 for (j, col) in row.iter().enumerate() {
+                    if col.character == 0u8 { continue; }
                     self.screen_ref.chars[i][j].write(*col);
                 }
             }