Rewrite NOpenCL.Buffer as generic type Buffer<T>

[sharwell]

Rename NOpenCL.Buffer to generic type Buffer<T>.

Indirectly resolves the naming collision with System.Buffer identified by @SunsetQuest in 74bc9ba.

[codecov]

Codecov Report

Merging #19 into master will not change coverage.
The diff coverage is 70.58%.

@@           Coverage Diff           @@
##           master      #19   +/-   ##
=======================================
  Coverage   37.33%   37.33%           
=======================================
  Files          55       55           
  Lines        2341     2341           
  Branches      385      385           
=======================================
  Hits          874      874           
  Misses       1318     1318           
  Partials      149      149

Impacted Files	Coverage Δ
NOpenCL/CommandQueue.cs	27.33% <ø> (ø)	⬆️
NOpenCL/KernelArgument.cs	37.93% <ø> (ø)	⬆️
NOpenCL/Image.cs	0% <ø> (ø)	⬆️
NOpenCL/Buffer`1.cs	16.66% <0%> (ø)
NOpenCL.Test/TestBuffers.cs	100% <100%> (ø)	⬆️
NOpenCL.Test/Intel/Optimization.cs	77.85% <100%> (ø)	⬆️
NOpenCL.Test/NVidia/VectorAdd.cs	82.4% <100%> (ø)	⬆️
NOpenCL/Context.cs	30.76% <100%> (ø)	⬆️
NOpenCL.Test/NVidia/Bandwidth.cs	57.97% <50%> (ø)	⬆️

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