Regularization TV additions

[RainerHeintzmann]

This is a slightly revised way to handle CUDA and TV.
However, note that the following two lines of test have been removed:
@test TV_cuda(num_dims=2)(x) ≈ reg(x)
@test TV_cuda(num_dims=3)(x) ≈ reg(x)

Is this acceptable?

[codecov-commenter]

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Codecov Report

❌ Patch coverage is 50.00000% with 27 lines in your changes missing coverage. Please review.
✅ Project coverage is 82.63%. Comparing base (57ae209) to head (578e54a).
⚠️ Report is 6 commits behind head on master.

Files with missing lines	Patch %	Lines
src/regularizer_cuda.jl	23.07%	20 Missing ⚠️
src/regularizer.jl	76.47%	4 Missing ⚠️
src/analysis_tools.jl	62.50%	3 Missing ⚠️
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HEAD has 1 upload less than BASE

Flag	BASE (57ae209)	HEAD (578e54a)
	2	1

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #53      +/-   ##
==========================================
- Coverage   91.39%   82.63%   -8.76%     
==========================================
  Files          13       13              
  Lines         616      622       +6     
==========================================
- Hits          563      514      -49     
- Misses         53      108      +55     

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[RainerHeintzmann]

... I now made it compatible with Optim Version 2.0. However this meant to return "missing" as time values in the trace callback.