Type annotations and fixes

[coveralls]

Pull Request Test Coverage Report for Build 94

• 311 of 394 (78.93%) changed or added relevant lines in 21 files are covered.
• 74 unchanged lines in 17 files lost coverage.
• Overall coverage increased (+1.6%) to 53.127%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
torrt/base_tracker.py	44	45	97.78%
torrt/notifiers/mail.py	8	9	88.89%
torrt/toolbox.py	23	24	95.83%
torrt/trackers/anidub.py	9	10	90.0%
torrt/trackers/anilibria.py	13	14	92.86%
torrt/trackers/kinozal.py	11	12	91.67%
torrt/trackers/nnmclub.py	10	11	90.91%
torrt/trackers/rutor.py	8	9	88.89%
torrt/trackers/rutracker.py	16	18	88.89%
torrt/trackers/casstudio.py	10	13	76.92%
<!--	Total:	311	394	78.93%	-->

Files with Coverage Reduction	New Missed Lines	%
torrt/base_rpc.py	1	84.21%
torrt/base_bot.py	2	75.0%
torrt/notifiers/mail.py	2	30.19%
torrt/trackers/nnmclub.py	2	60.87%
torrt/trackers/rutor.py	2	61.54%
torrt/utils.py	2	79.91%
torrt/base_notifier.py	3	71.43%
torrt/trackers/casstudio.py	3	43.75%
torrt/rpc/qbittorrent.py	5	26.17%
torrt/toolbox.py	5	76.25%
<!--	Total:	74		-->

Totals
Change from base Build 91:	1.6%
Covered Lines:	773
Relevant Lines:	1455

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💛 - Coveralls