Read units and other settings from project.toml if exists in same directory as input file

[jessfraz]

closes https://github.com/KittyCAD/cli/issues/886

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 80.88235% with 13 lines in your changes missing coverage. Please review.

Project coverage is 71.91%. Comparing base (a4446ce) to head (20e71c6). Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/cmd_kcl.rs	80.30%	13 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #891 +/- ## ========================================== + Coverage 71.86% 71.91% +0.05% ========================================== Files 36 36 Lines 6585 6613 +28 ========================================== + Hits 4732 4756 +24 - Misses 1853 1857 +4 ``` | [Flag](https://app.codecov.io/gh/KittyCAD/cli/pull/891/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=KittyCAD) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/KittyCAD/cli/pull/891/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=KittyCAD) | `71.91% <80.88%> (+0.05%)` | :arrow_up: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=KittyCAD#carryforward-flags-in-the-pull-request-comment) to find out more.

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