WIP fix for #160 - Configurable Line Height. This currently makes the…

[bobbylight]

… line height configurable when word wrap is NOT enabled. Line number list is also updated.

Fold indicators do not currently work properly - they only update in the demo app because I've tied '8' and '9' keypresses to tweaking the line height for quick testing.

I think what still needs to be done is:

• fold indicator immediate updating
• fold indicator rendering of 'active' fold line
• "classic" style of fold indicators doesn't render the "region" line indicator completely
• and everything when word wrap is enabled

[codecov]

Codecov Report

Attention: Patch coverage is 52.17391% with 11 lines in your changes missing coverage. Please review.

Project coverage is 80.38%. Comparing base (b0f9bed) to head (04b4524).

Files with missing lines	Patch %	Lines
...main/java/org/fife/ui/rtextarea/RTextAreaBase.java	25.00%	9 Missing ⚠️
...main/java/org/fife/ui/rtextarea/FoldIndicator.java	50.00%	1 Missing ⚠️
...ea/src/main/java/org/fife/ui/rtextarea/Gutter.java	50.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #433      +/-   ##
============================================
- Coverage     80.40%   80.38%   -0.03%     
- Complexity     7793     7794       +1     
============================================
  Files           178      178              
  Lines         30250    30264      +14     
  Branches       3911     3913       +2     
============================================
+ Hits          24323    24328       +5     
- Misses         4256     4264       +8     
- Partials       1671     1672       +1     

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