--strict-math has been deprecated and replaced by --math.  See less/less.js#3274

Still haven't updated for the grid breakpoints just yet, though some breakpoint loops have been written in anticipation of those updates.

There are 4 loops in mixins/_grid-framework.less that loop 'til a static number.  I'm not aware of any answer for that at the moment, but a plugin could be easily written that could just leverage `each()`.

Thanks @matthew-dean!

Except one in breakpoints.js:

```
91:6   warning  Variable 'nextBreakpoint' should be initialized on declaration
```

See less/less.js#3340

See less/less.js#3340

Co-Authored-By: calvinjuarez <[email protected]>

Co-Authored-By: calvinjuarez <[email protected]>

See seanCodes#14 (comment)

Co-Authored-By: calvinjuarez <[email protected]>

Co-Authored-By: calvinjuarez <[email protected]>

per seanCodes#14 (comment)

…ssue

See https://github.com/seanCodes/bootstrap-less-port/pull/14/files/94a03d156dde954caccf58130ebc8fa3adaf397e#r240023403

Reverting the name change for now, until @calvinjuarez is able to pull
in the plugin from NPM and alias it. (See [his
comment](seanCodes#14 (comment)
sion_r241965904).)

This change addresses [this PR review
comment](seanCodes#14 (comment)
sion_r239916331).

Reduce the number of changes in the PR to avoid potential bugs.

This change addresses [this PR review comment](seanCodes#14 (comment)).

Match var names used in the Sass version of the mixin.

This change addresses [this PR review comment](seanCodes#14 (comment)).

(instead of including at the end of a line)

Revert deletion of plugin files that add the `color()`, `gray()` and
`theme-color()` functions. Even though Less’ new ruleset accessors could
be used, we’re going to keep them for parity with the Sass version and
for backwards compatibility.

This change addresses [this PR review comment](seanCodes#14).

Revert the conversion the `color()`, `gray()` and `theme-color()`
functions to Less’ ruleset accessors. This change is primarily being
made to keep the syntax as similar to the Sass version as possible, for
easy reference/comparison.

Note that keeping things similar to Sass may prove unnecessary in the
future, so we may go back to accessors, but for now we’ll keep it like
this.

This change addresses [this PR review comment](seanCodes#14).

Instead of pulling the `value` directly from each item in the ruleset,
evaluate the item first to determine the true value of the item. This
fixes the issue where the `value` is actually a var name and what we
want is the the value of the var—not the var name itself.