Reworked the constants/enums

[niden]

Removed duplication in constants and moved everything to specific enums

[codecov]

Codecov Report

❌ Patch coverage is 96.46643% with 10 lines in your changes missing coverage. Please review.
✅ Project coverage is 86.20%. Comparing base (ecf0409) to head (d7a08d1).
⚠️ Report is 8 commits behind head on master.

Files with missing lines	Patch %	Lines
src/Compiler.php	93.42%	5 Missing ⚠️
src/Scanner/Scanner.php	96.36%	4 Missing ⚠️
src/Parser/Parser.php	98.95%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master      #74      +/-   ##
============================================
+ Coverage     86.17%   86.20%   +0.03%     
  Complexity     4484     4484              
============================================
  Files             9        9              
  Lines          6495     6517      +22     
============================================
+ Hits           5597     5618      +21     
- Misses          898      899       +1     

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