Set source encoding for template files

[alerosmile]

Closes #793

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 76.47059% with 4 lines in your changes missing coverage. Please review.

Project coverage is 74.19%. Comparing base (92fee05) to head (df87db8).
Report is 158 commits behind head on master.

Files with missing lines	Patch %	Lines
src/main/java/org/vafer/jdeb/DebMaker.java	75.00%	2 Missing and 1 partial ⚠️
src/main/java/org/vafer/jdeb/ControlBuilder.java	80.00%	1 Missing ⚠️

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Additional details and impacted files

@@             Coverage Diff              @@
##             master     #804      +/-   ##
============================================
+ Coverage     71.03%   74.19%   +3.15%     
- Complexity       96      118      +22     
============================================
  Files             7        8       +1     
  Lines           580      620      +40     
  Branches         75       81       +6     
============================================
+ Hits            412      460      +48     
+ Misses          121      107      -14     
- Partials         47       53       +6     

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[tcurdt]

Looking good thanks!