Move value_string defs from .h file; create/use extended value_string; Other minor...

Move value_string defs from .h file; create/use extended value_string; Other minor changes.

- Multiple value string arrays were defined in packet-fcels.h (which was included
  in two differnt .c files). Only one of the arrays was actually used in two
  different .c files. All the value_string arrays (and most of the #defines)
  moved to packet-fcels.c.

- Other:
  Use -1 instead of tvb_length() for the length param of several proto_tree_add...() calls.
  Add editor modelines.

Change-Id: Idc642caf1c8d62b658147a234d5560b8f2fd0630
Reviewed-on: https://code.wireshark.org/review/479
Reviewed-by: Bill Meier <wmeier@newsguy.com>
Tested-by: Bill Meier <wmeier@newsguy.com>