Implementing Key Override

- converting shift backspace to this setup since its simpler
- Just commented out the existing code in case this doesn't work
- May convert some of the symbols to this instead of a hold

users/t4corun/features/keyoverride.c

@@ -0,0 +1,13 @@
+#include "keyoverride.h"
+
+const key_override_t delete_override    = ko_make_basic(MOD_MASK_SHIFT, KC_BSPC, KC_DEL);
+const key_override_t medianext_override = ko_make_basic(MOD_MASK_SHIFT, KC_MNXT, KC_MPRV);
+
+
+const key_override_t **key_overrides = (const key_override_t *[]){
+
+    &delete_override,
+    &medianext_override,
+    NULL // Null terminate the array of overrides!
+
+};