Syntax highlight and stats fixes

A lot of new stuff in this release:

• Hashtags support (A hashtag is a word starting with # symbol): add, remove, replace, and filter by hashatgs
• New commands to manage custom tags (--set-tag and --del-tag)
• Fix incorrect calculation of the number of due todos in stats output
• Syntax highlight for subject output

Fix `postpone` and clippy warnings

• Fixed: postpone did not change due date. Only --dry-run worked as expected
• Clippy fixes

Fix create date for recurrent tasks

• Now when a recurrent task is done, the new todo cloned from the original one gets today's date as todo's creation date. Only if the original todo had creation date set
• -all option did not work correctly: even with this option TTDL never displayed todos with threshold date in the future. Now --all shows everything
• Version 3.4.4 is the same as 3.4.3. The only difference is that todo_lib version increased due to updating a test(no other code changes) and Cargo.toml now runs stripping debug info from the release binary automatically. That was why 3.4.3 release was not announced.

Fix "broken pipe " panic on Linux - update

• Found and fixed the remained eprintln in case of broken pipe
• Bump dependencies

Fix "broken pipe " panic on Linux

Fix broken pipe (#60)

Fix panic on Linux when TTDL is used with utilities like head: `ttdl l | head -1`

Fix setting recurrence

Command set-rec only modified only todos that were marked done: it cleared done flag and applied the new recurrence. Normal todos remained unchanged.

Calendar preview

Add new list switch --calendar to display to quick peek what is on your plate in a convenient mode. See details in README

Replace crate

No logic changed.

• Replace 'failure' crate with 'thiserror' one (because of https://github.com/VladimirMarkelov/ttdl/security/dependabot/1)
• Clippy fixes

Recurrence reworked

1. On completion threshold date also moves to the future when a todo with recurrence is completed
2. Recurrent todos are not modified on completion. they are marked as "done" and a new todo(clone of original one) with changed due and threshold dates is created

ID list and range parsing improvements

• Fixed: ID 1 was always ignored when list of IDs was passed to TTDL
• Fixed: generate list of unique IDs. Before 1,2,2 or 1,1-3 sent duplicated ID with number 2 to todo_lib.
• New: list and ranges of IDs can be mixed
• New: range of IDs now detect low and high ends automatically. Now list 1-3 and list 3-1 prints the same tasks in the same order.