[tahoe-lafs-trac-stream] [Tahoe-LAFS] #3995: Remove the various dead code from `src/allmydata/util/base32.py`

[Tahoe-LAFS]

#3995: Remove the various dead code from `src/allmydata/util/base32.py`
---------------------+---------------------------
 Reporter:  exarkun  |          Owner:
     Type:  defect   |         Status:  new
 Priority:  normal   |      Milestone:  undecided
Component:  unknown  |        Version:  n/a
 Keywords:           |  Launchpad Bug:
---------------------+---------------------------
 * `could_be_base32_encoded` is "look before you leap".  If you want to
 know if it is base32 encoded, decode it and find out.  This should be
 removed.
 * A lot of module-level constants like `c2vtranstable` and
 `rfc3548_alphabet` are unnecessary if we don't have
 `could_be_base32_encoded`.

 Delete the stuff in this module that we don't actually use or need.

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Ticket URL: <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3995>
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