feat(block): support placing the title on bottom

[orhun]

Upstream: #669

Description

Before you could only put the title on the top row of a block. Now you can put it on the bottom row! Revolutionary.

In the future, implementing an option for both a bottom and top title is possible, but seems unnecessary considering you could just manually have a Layout and do the work yourself at that point, and having support for title wizardry seems pointless. The farthest you could go is having an option to actually move the title everywhere; it's an easy extension and seems like something that would normally be built-in. Hence here it is; you can do top and bottom, left right and center.

Testing guidelines

When creating a Block with, say, Block::default().title(), slap on a .title_on_bottom(). Check tests/widget_block.rs for the tests, which are just a copy of the alignment tests.

Checklist

• I have read the contributing guidelines.
• I have added relevant tests.
• I have documented all new additions.

[mindoodoo]

@rabirabirara The test you added seems to be failing.

[Benjscho]

I have a fix for the tests added, appears the expected behaviors were incorrectly input. Added a pull request for the branch here so this can be merged: #88

[sayanarijit]

Merged #88 into this branch, however, note that since it's a new feature, it's still out of scope for the initial release.

[mindoodoo]

Seems like a small useful feature, I'm in favor of adding it in. Thoughts @sayanarijit @orhun ?

[orhun]

Yup, I agree. (approved)

[Xithrius]

Thank you for implementing this feature! (Am author of fdehau/tui-rs#625)