Simplify and update wrappers

[maleadt]

This PR does away with the pointers.json, instead making it possible to directly edit the generated headers. When wrapping new headers, the script detects new function signatures and adds those to the wrapper (not touching old ones), and moves removed ones to a deprecated file.

Together with those changes, I updated the wrappers for CUDA 11 update 1, CUTENSOR 1.2, and CUDNN 8.

cc @denizyuret, since you are working on updating our CUDNN wrappers. You can now just edit the libcudnn.jl file (but only for necessary changes, e.g., to change a Ptr to CuPtr).

[codecov]

Codecov Report

Merging #416 into master will increase coverage by 0.71%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master     #416      +/-   ##
==========================================
+ Coverage   78.83%   79.55%   +0.71%     
==========================================
  Files         170      170              
  Lines        8823     8739      -84     
==========================================
- Hits         6956     6952       -4     
+ Misses       1867     1787      -80     

Impacted Files	Coverage Δ
lib/cudnn/CUDNN.jl	51.61% <ø> (ø)
lib/cusparse/CUSPARSE.jl	88.23% <ø> (ø)
res/wrap/wrap.jl	0.00% <0.00%> (ø)
lib/cublas/CUBLAS.jl	78.72% <0.00%> (-4.26%)	⬇️
lib/curand/random.jl	90.32% <0.00%> (-3.23%)	⬇️

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