refactoring changes, added new Pin class and clockPinManager Class

[shahrajsingh]

Updated the PinMap class:
Removed the inner Pin class.
Removed the clockPin variable and associated getter and setter methods.
Made the PinMap class inherit from the ClockPinManager class.

[codecov-commenter]

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Codecov Report

❌ Patch coverage is 86.84211% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 56.6%. Comparing base (aa9c142) to head (a7689e7).
⚠️ Report is 70 commits behind head on master.

Files with missing lines	Patch %	Lines
.../de/neemann/digital/builder/ATF150x/ATFDevice.java	0.0%	3 Missing ⚠️
...va/de/neemann/digital/builder/ClockPinManager.java	80.0%	0 Missing and 1 partial ⚠️
...c/main/java/de/neemann/digital/builder/PinMap.java	83.3%	0 Missing and 1 partial ⚠️
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Additional details and impacted files

@@           Coverage Diff            @@
##             master   #1144   +/-   ##
========================================
  Coverage      56.5%   56.6%           
- Complexity     6571    6576    +5     
========================================
  Files           679     681    +2     
  Lines         35494   35512   +18     
  Branches       4792    4795    +3     
========================================
+ Hits          20082   20109   +27     
+ Misses        14202   14196    -6     
+ Partials       1210    1207    -3     

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