cleanup, twig prep, typehints

Added

• Local development helps

Changed (breaking)

• Always use the material theme
• Added PHP typehints to module code

Changed (non-breaking)

• Moved PHP code out of templates in preparation for conversion to Twig templating
• Made the ADMIN_EMAIL variable no longer required

Fixed

• Fixed a "not found" error on the simplewebauthn browser.js file, which prevented use of a Webauthn 2sv option at login
• Fixed failure in hub mode due to a missing dependency (AWS SDK)
• Fixed failure to run complete migrations. Reverted the migration namespace back to the original (\Sil\SilAuth\migrations).
• Better error handling for manager "rescue" code request failure