Adaptive time stepping

[KnutAM]

Adaptive time stepping.

TODO before merging

• [x] documentation
• [x] ~test case for a problem that doesn't converge for large time steps and needs resetting~ (Plasticity example will have to do for now)

[codecov-commenter]

Codecov Report

Merging #1 (cb1dfcb) into main (3fe75f0) will increase coverage by 4.34%. The diff coverage is 85.29%.

@@            Coverage Diff             @@
##             main       #1      +/-   ##
==========================================
+ Coverage   80.00%   84.34%   +4.34%     
==========================================
  Files           4        6       +2     
  Lines          60      115      +55     
==========================================
+ Hits           48       97      +49     
- Misses         12       18       +6     

Impacted Files	Coverage Δ
src/userfunctions.jl	0.00% <0.00%> (ø)
src/FerriteSolvers.jl	85.71% <75.00%> (-3.18%)	:arrow_down:
src/utils.jl	75.00% <75.00%> (ø)
src/nlsolvers.jl	79.41% <81.25%> (-0.59%)	:arrow_down:
src/timesteppers.jl	88.67% <90.69%> (+28.67%)	:arrow_up:

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[KnutAM]

Closing as included in #7