[tor-bugs] #12504 [BridgeDB]: Create BridgeDB config setting for which Pluggable Transports are supported

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#12504: Create BridgeDB config setting for which Pluggable Transports are supported
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 Reporter:  isis                                 |          Owner:  isis
     Type:  enhancement                          |         Status:  new
 Priority:  minor                                |      Milestone:
Component:  BridgeDB                             |        Version:
 Keywords:  easy, bridgedb-ui, pluggable-        |  Actual Points:
  transports, bridgedb-0.2.x                     |         Points:
Parent ID:                                       |
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 Currently, there is a list of the "currently supported Pluggable
 Transports" in `bridgedb.strings`. This module attribute can be used to
 change which PTs are listed in the dropdown menu on
 https://bridges.torproject.org/options, as well as in the list sent out in
 email responses. Changing this will easily change what both UIs display,
 however, there still are some sections of BridgeDB's code where the
 supported PTs are hardcoded.

 We need to:

  1. Identify where and why PT method names are hardcoded.
  2. Create a config setting in `bridgedb.conf` to set this list globally
 (in the UI, and in code logic).
  3. Get rid of all the hardcoded PT method names in (1) and replace them
 with the thing from (2).

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/12504>
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