Ace widget

[kgullikson88]

Adds the Ace editor as a widget. This addresses #864

[codecov]

Codecov Report

Merging #908 into master will increase coverage by 0.13%.
The diff coverage is 84.84%.

@@            Coverage Diff             @@
##           master     #908      +/-   ##
==========================================
+ Coverage   84.96%   85.09%   +0.13%     
==========================================
  Files         104      106       +2     
  Lines       10636    10669      +33     
==========================================
+ Hits         9037     9079      +42     
+ Misses       1599     1590       -9

Impacted Files	Coverage Δ
panel/tests/widgets/test_ace.py	100% <100%> (ø)
panel/widgets/__init__.py	100% <100%> (ø)	⬆️
panel/widgets/ace.py	77.27% <77.27%> (ø)
panel/pane/vtk/vtk.py	53.43% <0%> (+1.05%)	⬆️
panel/interact.py	76.07% <0%> (+2.5%)	⬆️
panel/util.py	92.62% <0%> (+4.09%)	⬆️

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[philippjfr]

This looks great, thanks so much! Would you do me one favor and clear the notebook and then commit it again?

[philippjfr]

Thanks again!