Parameter Function Bug Fix

[pulsipher]

Fixed erroneous naming for anonymous parameter functions that use anonymous functions. Moreover, added functionality to allow anonymous functions defined with indexed parameter inputs, for instance:

@parameter_function(model, pfunc[i = 1:2] == (t, x[i]) -> t + x[i])

[codecov]

Codecov Report

Merging #144 (e41a58d) into master (032a20e) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #144   +/-   ##
=======================================
  Coverage   99.96%   99.96%           
=======================================
  Files          32       32           
  Lines        6127     6150   +23     
=======================================
+ Hits         6125     6148   +23     
  Misses          2        2           

Impacted Files	Coverage Δ
src/macros.jl	100.00% <100.00%> (ø)

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