Use platform independent file name in configuration

[alonbl]

Description

Current implementation searches the file as provided by user or glob, this name may be platform specific.

New implementation will always use '/' as separator, enabling the same configuration to be used in any platform.

[alonbl]

sorry, the import os was dropped during my rebase.

[codecov[bot]]

Codecov Report

All modified lines are covered by tests :white_check_mark:

Comparison is base (57e7f8b) 95.87% compared to head (d8f0ad6) 95.87%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1015 +/- ## ======================================= Coverage 95.87% 95.87% ======================================= Files 1500 1500 Lines 28262 28264 +2 ======================================= + Hits 27095 27097 +2 Misses 1167 1167 ``` | [Files](https://app.codecov.io/gh/jeremiah-c-leary/vhdl-style-guide/pull/1015?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Jeremiah+Leary) | Coverage Δ | | |---|---|---| | [vsg/apply\_rules.py](https://app.codecov.io/gh/jeremiah-c-leary/vhdl-style-guide/pull/1015?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Jeremiah+Leary#diff-dnNnL2FwcGx5X3J1bGVzLnB5) | `88.23% <100.00%> (+0.23%)` | :arrow_up: |

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[jeremiah-c-leary]

Morning @alonbl,

Thanks for the pull request. I appreciate the improved portability this PR provides.

--Jeremy