Separate variable type, transformation, steady state behaviour, and final condition type

[bbejanov]

• [x] Allowing for different terminal conditions for different variables
• [x] Supporting variables with negative exponential growth
• [ ] Supporting variables that have exponential growth, but that take positive and negative values over history

[codecov-io]

Codecov Report

Merging #22 into master will increase coverage by 1.47%. The diff coverage is 80.00%.

@@            Coverage Diff             @@
##           master      #22      +/-   ##
==========================================
+ Coverage   74.24%   75.72%   +1.47%     
==========================================
  Files          19       20       +1     
  Lines        1227     1240      +13     
==========================================
+ Hits          911      939      +28     
+ Misses        316      301      -15     

Impacted Files	Coverage Δ
src/StackedTimeSolver.jl	100.00% <ø> (ø)
src/StateSpaceEcon.jl	100.00% <ø> (ø)
src/SteadyStateSolver.jl	100.00% <ø> (ø)
src/stackedtime/misc.jl	72.13% <ø> (+10.93%)	:arrow_up:
src/steadystate/1dsolvers.jl	90.32% <ø> (ø)
src/steadystate/diagnose.jl	24.44% <ø> (ø)
src/steadystate/global.jl	57.57% <ø> (ø)
src/steadystate/lm.jl	3.50% <ø> (ø)
src/steadystate/nr.jl	34.37% <ø> (ø)
src/steadystate/presolve.jl	84.84% <ø> (ø)
... and 14 more

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