Fixed the bugs in displaying the grid with fit_into_width

[mtsoltan]

These changes were initiated to fix the behavior of term-grid in uutils's ls, which uses term-grid 0.1.7 but can't upgrade to 0.2.0 due to the existence of these bugs.

Ideally, I'd like to upgrade to 0.2.0, offloading a lot of padding/alignment code to term-grid instead.

Things I've taken care of:

• Fixed loop boundaries.
• Allowed grid to try to utilize the maximum width it can, optimizing for line-count.

Things I've not taken care of, yet:

• I didn't create a test to make sure this behavior does not regress.
• I didn't fix the other bug where terminal color-codes ruin the width calculation.

[untitaker]

@ogham is it possible for those changes to be merged? 0.2.0 feels fundamentally broken because of the presence of those bugs. In fact it seems like term-grid gives up on producing a grid if the content has to produce more than one row in any way.

I can confirm that 0.1.7 works fine for me, and so does 0.2.0 after applying this patch.

[tertsdiepraam]

@mtsoltan We've finally decided to make a fork of this library for uutils: https://github.com/uutils/uutils-term-grid. Feel free to reopen this PR there!

[mtsoltan]

@tertsdiepraam
On it once I wake up (in 9 hours)~

[mtsoltan]

Forgot about this, just did it now! Sorry~