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We were leaving connections to the database open, which causes some
calls to hang. This adds destructors to the SQLite3 class and the
classes that use it, and refactors some code to make one database
connection per class object. This also makes sure that the destructors
for objects that use databases are actually called.

This change expands the locale parse to have the following properties:
- if only the language code is given, choses the regionalization that
occurs first in the locale list (e.g., "en" --> "en-US"
- if regionalization for the language is *not* present, choses the
generalized language or a different regionalization (e.g. "pt-PT" -->
"pt-BR")
- parses both the subject and body looking for the most specific
regionalization
- defaults to en-US if no available language is found

This commit refactors build_request to prevent duplicate code. It
also moves the platforms definition to the parser constructor.

Before we were conflating the locales for the tor browser binaries with
the available locale for gettor email body localizations. This patch
checks our links database for available locales.

Update code and repository structure
Lay foundation to add testing and testing coverage