add line history with up/down keys

src/misc_tools.h

@@ -43,3 +43,6 @@ int qsort_strcasecmp_hlpr(const void *nick1, const void *nick2);
       - cannot start with a space
       - must not contain contiguous spaces */
 bool valid_nick(uint8_t *nick);
+
+/* Moves the cursor to the end of the line in given window */
+void mv_curs_end(WINDOW *w, size_t len, int max_y, int max_x);