Add omit_uri option to skip Reference URI attributes.

[robrichards]

Lets callers create References without a URI (and without assigning an Id on the target element solely for that fragment).

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[codecov]

Codecov Report

❌ Patch coverage is 84.61538% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 71.91%. Comparing base (dc0fe3e) to head (375241f).

Files with missing lines	Patch %	Lines
src/XMLSecurityDSig.php	84.61%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #284      +/-   ##
============================================
+ Coverage     71.85%   71.91%   +0.06%     
- Complexity      508      510       +2     
============================================
  Files             4        4              
  Lines          1350     1353       +3     
============================================
+ Hits            970      973       +3     
  Misses          380      380              

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