git.log improvements

[StartAutomating]

Improving Conventional Commit Support

ugit already supports conventional commits, and it would make collaboration and release notes easier to organize if the log object supported conventional commits.

• git.log.CommitType should get the type of the conventional commit #301
• git.log.Scope should get the commit scope #303
• git.log.Description should get the commit description #304

Improving Performance

• git.log.Trailer(s) should be parsed in a script property #305
• git.log.Change(s) should be parsed in a script property #306
• git.log.CommitDate should be a script property #309
• git log should not accumulate $input #308

Improving Jira Integration

• git.log.get_JiraTicket(s) should get Jira references #313
• git log -IssueNumber should be aliased to -TicketNumber #315

Improving Usability

• git.log.UserName should be an alias to GitUserName #314