Two Factor refactoring. Introduce TwoFactorProcessors. #399

Job	Run time
testsuite (7.4, sqlite)	10s
Coding Standard & Static Analysis	10s
testsuite (7.4, mysql)	23s
testsuite (7.4, pgsql)	19s
testsuite (8.0, sqlite)	18s
testsuite (8.0, mysql)	22s
testsuite (8.0, pgsql)	23s
testsuite (8.1, sqlite)	17s
testsuite (8.1, mysql)	28s
testsuite (8.1, pgsql)	16s
testsuite (8.2, sqlite)	11s
testsuite (8.2, mysql)	22s
testsuite (8.2, pgsql)	16s
testsuite (8.3, sqlite)	16s
testsuite (8.3, mysql)	33s
testsuite (8.3, pgsql)	25s
	5m 9s

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