nginx: fix parameter inclution

tileserver_parm reset z/y/z.
If loading just before tilesrever called,
x/y/z always become 0.

To fix it, mv inclution is occor at first only once.
tileserver: fix tirex comunication

- send_tile_tirex() should call master socket.
- workaround for shared variable problem.
- fix deserialize_tirex_msg() problem that
  lost string values.
- isnumber() is not nessesary now. remove it.

Known Bug: id field is always 'luats-0' not counting up.
because shared variable is not worked.