Add option to disable the watermark on invoices and quotes

[pierredup]

Closes #411

[codecov]

Codecov Report

Patch coverage: 76.66% and project coverage change: +0.03 🎉

Comparison is base (ecc3c8e) 50.82% compared to head (19e74ec) 50.85%.

Additional details and impacted files

@@             Coverage Diff              @@
##              2.2.x     #431      +/-   ##
============================================
+ Coverage     50.82%   50.85%   +0.03%     
- Complexity     2193     2205      +12     
============================================
  Files           411      411              
  Lines          7547     7562      +15     
============================================
+ Hits           3836     3846      +10     
- Misses         3711     3716       +5     

Flag	Coverage Δ
unittests	50.85% <76.66%> (+0.03%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...yBundle/Twig/Extension/MoneyFormatterExtension.php	78.57% <50.00%> (-21.43%)	⬇️
src/MoneyBundle/Formatter/MoneyFormatter.php	83.33% <76.92%> (-0.54%)	⬇️
src/CoreBundle/Util/ClassUtil.php	95.23% <85.71%> (-4.77%)	⬇️
...ettingsBundle/Form/Handler/SettingsFormHandler.php	100.00% <100.00%> (ø)

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