Don't use Thread.Sleep() analyzers - initial implementation

[tmaczynski]

I've created two analyzers:

• first which reports usage of Thread.Sleep() inside of asynchronous code (i.e. asynchronous methods, asynchronous anonymous functions or asynchronous anonymous methods).
• second which reports usage of Thread.Sleep() anywhere Analyzers have a common code fix which fixes occurrences of Thread.Sleep() in async code. If Thread.Sleep is used in non async code, there's no obvious automatic fix for the code, so no codefix is proposed.

I've made a decision to treat "async void" code as asynchronous.

I think that the first analysis should be active by default.

I've updated version of Microsoft.CodeAnalysis in a separate commit - if I recall correctly, I needed some functionality from the newer version. I did not observe any regression.

I've also updated a version of Visual Studio in sln file in a separate commit. I guess that majority of people use the most recent version of VS2015 so I think that it's convenient to include that change in repo.

I don’t know whether contributors are listed somewhere. I added comments listing me as a contributor in my pull request, but feel free to remove them if you want.

[codecov-io]

Codecov Report

Merging #50 into master will increase coverage by 0.47%. The diff coverage is 93.45%.

@@            Coverage Diff             @@
##           master      #50      +/-   ##
==========================================
+ Coverage   81.75%   82.22%   +0.47%     
==========================================
  Files          36       49      +13     
  Lines        2970     3741     +771     
  Branches      226      252      +26     
==========================================
+ Hits         2428     3076     +648     
- Misses        434      553     +119     
- Partials      108      112       +4

Impacted Files	Coverage Δ
...ers/Usage/DontUseThreadSleepInAsyncCodeAnalyzer.cs	100% <100%> (ø)
...ageAnalyzers.Test/Usage/DontUseThreadSleepTests.cs	100% <100%> (ø)
...UsageAnalyzers/Usage/DontUseThreadSleepAnalyzer.cs	100% <100%> (ø)
...nalyzers.Test/Usage/DontUseThreadSleepTestsBase.cs	100% <100%> (ø)
...s.Test/Usage/DontUseThreadSleepInAsyncCodeTests.cs	100% <100%> (ø)
...yncUsageAnalyzers/Usage/UsageResources.Designer.cs	21.66% <22.22%> (ø)
...ageAnalyzers/Helpers/ExpressionSyntaxExtensions.cs	77.08% <77.08%> (ø)
...eAnalyzers/Usage/DontUseThreadSleepAnalyzerBase.cs	84.21% <84.21%> (ø)
.../DontUseThreadSleepCodeUniversalCodeFixProvider.cs	93.2% <93.2%> (ø)
...nalyzers/AsyncUsageAnalyzers/AnalyzerExtensions.cs	66.19% <0%> (-4.23%)	:arrow_down:
... and 16 more

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[tmaczynski]

It's been a while since I've created this PR. Do you have more feedback? I would like to make further contributions to this project, but I don't know if it's still maintained.

[tmaczynski]

I've moved DontUseThreadSleep.md and DontUseThreadSleepInAsyncCode.md to a documentation folder and updated them slightly.