reworked copy/move methods to include "avoid_clashes" feature

[tclose]

Added ability to specify and 'avoid_clashes' arg to copy and move methods to add an incrementing counter (e.g. 'file.txt' -> 'file (1).txt') to filenames

[codecov]

Codecov Report

Attention: Patch coverage is 76.38889% with 17 lines in your changes missing coverage. Please review.

Project coverage is 91.80%. Comparing base (1aa60ea) to head (0e3fa13).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
fileformats/core/fileset.py	76.38%	10 Missing and 7 partials ⚠️

❌ Your patch status has failed because the patch coverage (76.38%) is below the target coverage (80.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #99      +/-   ##
==========================================
+ Coverage   91.68%   91.80%   +0.11%     
==========================================
  Files          47       47              
  Lines        5306     5332      +26     
  Branches      391      398       +7     
==========================================
+ Hits         4865     4895      +30     
+ Misses        335      329       -6     
- Partials      106      108       +2     

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