Show code snippet erros in html reports

[BraisGabin]

This PR is realted with #2134

If an exception is found in the code snippet rendering instead to be too smart, or crash, or hide the error this code shows the error to the user like this:

The link opens the github issue form with some pre-filled information:

And github render that information like this:

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Problems in this PR:

• I don't know how to get the detekt version to autofill it. Any idea?
• What if the issue is related with a plugin and not with detekt itself? We are saying to the users to report it here. Should we care about this? If we see a spam of issues related with plugins we can remove the link. What do you think?

[codecov-io]

Codecov Report

Merging #2209 into master will increase coverage by 0.21%.
The diff coverage is 95.65%.

@@             Coverage Diff              @@
##             master    #2209      +/-   ##
============================================
+ Coverage      81.2%   81.41%   +0.21%     
  Complexity     2064     2064              
============================================
  Files           340      340              
  Lines          5910     5934      +24     
  Branches       1076     1077       +1     
============================================
+ Hits           4799     4831      +32     
+ Misses          535      526       -9     
- Partials        576      577       +1

Impacted Files	Coverage Δ	Complexity Δ
...otlin/io/gitlab/arturbosch/detekt/core/Detektor.kt	48.78% <0%> (ø)	5 <0> (ø)	⬇️
...tlab/arturbosch/detekt/cli/out/HtmlOutputReport.kt	91.93% <100%> (ø)	17 <0> (ø)	⬇️
...lin/io/gitlab/arturbosch/detekt/core/DebugUtils.kt	58.33% <100%> (+58.33%)	0 <0> (ø)	⬇️
...n/io/gitlab/arturbosch/detekt/cli/out/HtmlUtils.kt	98.07% <97.67%> (+5.21%)	0 <0> (ø)	⬇️

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[arturbosch]

Cool, looks really good.

1. In detekt-core we have whichDetekt() to get the version.
2. Lets see what will be reported.

[BraisGabin]

whichDetekt() was exactly what I needed. Done, ready to review :).