Refactor temporal profiles

[SebastianM-C]

• Use dispatch instead of a sub-module
• Compute directly the real part

[codecov]

Codecov Report

Merging #11 into master will increase coverage by 1.87%.
The diff coverage is 52.94%.

@@            Coverage Diff             @@
##           master      #11      +/-   ##
==========================================
+ Coverage   66.66%   68.53%   +1.87%     
==========================================
  Files           7        7              
  Lines          90       89       -1     
==========================================
+ Hits           60       61       +1     
+ Misses         30       28       -2     

Impacted Files	Coverage Δ
src/LaserTypes.jl	100.00% <ø> (ø)
src/gauss.jl	100.00% <ø> (ø)
src/envelopes.jl	38.46% <38.46%> (+21.79%)	⬆️
src/electricfield.jl	66.66% <100.00%> (ø)
src/laguerre-gauss.jl	100.00% <100.00%> (ø)
src/magneticfield.jl	73.33% <100.00%> (ø)

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