patch 8.0.0739: terminal resizing doesn't work well.

Problem:    Terminal resizing doesn't work well.
Solution:   Resize the terminal to the Vim window and the other way around.
            Avoid mapping typed keys.  Set the environment properly.

src/structs.h

@@ -1732,6 +1732,12 @@ typedef struct
     int		jo_id;
     char_u	jo_soe_buf[NUMBUFLEN];
     char_u	*jo_stoponexit;
+
+#ifdef FEAT_TERMINAL
+    /* when non-zero run the job in a terminal window of this size */
+    int		jo_term_rows;
+    int		jo_term_cols;
+#endif
 } jobopt_T;