PDF support; several new importers; minor improvements

New Features

• add genericpdf paycheck importer. [Ammon Sarver]
• add bamboohr paycheck importer. [Ammon Sarver]
• add pdfreader libreader importer. [Ammon Sarver]

New Importers

• add CSV importer for Digital Credit Union (#89) [Harlan Lieberman-Berg]
• add importer for Alliant Federal Credit Union (#88) [Harlan Lieberman-Berg]
• add schwab csv credit line importer. [Red S]

Improvements

• minor: add 'show_configured' in paycheck transaction builder. [Red S]
• minor: add_custom_postings to banking.py. [Red S]
• minor: add identification based on filename to schwab importers. [Red S]
• minor: overridable add_custom_postings() [Red S]
• minor: add tdameritrade to template.cfg. [Red S]

Fixes

• update requirements to add back lost packages. [Ammon Sarver]
• schwab_csv_creditline balance sign. [Red S]
• add file encoding support to csvreader. [Ad Timmering]
• only emit filing account metadata if configured #97. [Red S]
• one-file-per-account broke with smart_importer #97. [Red S]
• timestamp issue in balance assertions. [Red S]
• balance date on test. [Red S]
• schwab tests. [Red S]
• schwab doesn't use a header in their csv any more. [Red S]
• schwab_csv_checking format changed #91. [Red S]

Other

• enforce formatting with ruff. [Rane Brown]
• format with isort, use pyproject.toml. [Rane Brown]
• switch to ruff for linting (#90) [Harlan Lieberman-Berg]
• style: reformat to 99 col width (previously 88 col) [Red S]