Refs #984: Disallow loading arbitrary files using the template_source…

[matthiask]

… debugging view

[codecov]

Codecov Report

Merging #1008 into master will increase coverage by 0.03%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #1008      +/-   ##
==========================================
+ Coverage   83.92%   83.95%   +0.03%     
==========================================
  Files          28       28              
  Lines        1580     1583       +3     
  Branches      236      236              
==========================================
+ Hits         1326     1329       +3     
  Misses        188      188              
  Partials       66       66

Impacted Files	Coverage Δ
debug_toolbar/panels/templates/panel.py	88.28% <100%> (+0.28%)	⬆️
debug_toolbar/panels/templates/views.py	78.57% <100%> (ø)	⬆️

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