Added screen_delete_line routine

kernel/include/kernel/screen.h

@@ -32,4 +32,14 @@ size_t screen_write(char *buf, size_t len);
 
 void screen_delete(void);
 
+/*
+ * screen_delete_line:
+ *  Deletes current line and updates the position of the cursor. The cursor
+ *  will be placed at the beginning of the current line after this routine
+ *  ends.
+ *
+ */
+
+void screen_delete_line(void);
+
 #endif

kernel/screen/src/screen.c

@@ -82,3 +82,19 @@ void screen_delete(void) {
 
 }
 
+/*
+ * screen_delete_line:
+ * -------------------
+ *
+ *  Repeat screen_delete until the whole line is deleted.
+ *
+ */
+
+void screen_delete_line(void) {
+
+    while (screen_column)
+        screen_delete();
+
+}
+
+