Issue#1059: Performance improvements:

[jeremiah-c-leary]

• Added lower value to token and removed .lower() in other files
• Simplified find_next_token

Resolves #1059

[codecov]

Codecov Report

Attention: Patch coverage is 93.97590% with 5 lines in your changes are missing coverage. Please review.

Project coverage is 96.54%. Comparing base (baf22da) to head (e37b692).
Report is 13 commits behind head on master.

❗ Current head e37b692 differs from pull request most recent head e60b4e1. Consider uploading reports for the commit e60b4e1 to get more accurate results

Files	Patch %	Lines
vsg/vhdlFile/utils.py	75.00%	4 Missing ⚠️
vsg/rules/multiline_structure.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1064      +/-   ##
==========================================
+ Coverage   94.01%   96.54%   +2.53%     
==========================================
  Files        1557     1530      -27     
  Lines       29028    28839     -189     
  Branches     3414        0    -3414     
==========================================
+ Hits        27291    27844     +553     
+ Misses       1303      995     -308     
+ Partials      434        0     -434     

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