Fix: Libs: KiCad: Fileformat: Permit version key in fp-lib-table file to be absent

[sam-mellor]

Fix: Libs: KiCad: Fileformat: Permit version key in fp-lib-table file to be absent

Description

Expected file contents:

(fp_lib_table
  (version 7)
  (lib ...)
)

On my machine:

(fp_lib_table
  (lib ...)
)

Resulting in DecodeError: Failed to decode fp_lib_table

This allows for decoding in both cases.

TODO: retain the version number check, when present

Checklist

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