Added JsonConverter attributes where appropriate to allow for more ad…

[david-driscoll]

…hoc serialziation in things like commands for example

[codecov]

Codecov Report

Merging #271 into master will decrease coverage by 0.07%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master     #271      +/-   ##
==========================================
- Coverage   64.21%   64.14%   -0.08%     
==========================================
  Files         374      376       +2     
  Lines       12394    12394              
  Branches     1419     1419              
==========================================
- Hits         7959     7950       -9     
- Misses       3964     3978      +14     
+ Partials      471      466       -5     

Impacted Files	Coverage Δ
src/Protocol/DocumentUri.cs	66.11% <ø> (ø)
src/Protocol/Models/BooleanNumberString.cs	64.44% <ø> (ø)
src/Protocol/Models/BooleanString.cs	0.00% <ø> (ø)
src/Protocol/Models/CommandOrCodeAction.cs	0.00% <ø> (ø)
src/Protocol/Models/CompletionList.cs	24.19% <ø> (ø)
src/Protocol/Models/DiagnosticCode.cs	45.45% <ø> (ø)
src/Protocol/Models/LocationOrLocationLink.cs	100.00% <ø> (ø)
src/Protocol/Models/LocationOrLocationLinks.cs	50.00% <ø> (ø)
src/Protocol/Models/MarkedString.cs	84.61% <ø> (ø)
...rc/Protocol/Models/MarkedStringsOrMarkupContent.cs	62.50% <ø> (ø)
... and 15 more

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