Add InterfaceDir template variable

[LandonTClipp]

Description

Adding a new template variable InterfaceDir. This will be used to place your mocks next to your original mocked interface.

This fixes #574

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Version of Golang used when building/testing:

• 1.11
• 1.12
• 1.13
• 1.14
• 1.15
• 1.16
• 1.17
• 1.18
• 1.19
• 1.20

How Has This Been Tested?

Unit tests

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

[codecov]

Codecov Report

Patch coverage: 100.00000% and project coverage change: +0.02882 🎉

Comparison is base (e478c25) 74.40812% compared to head (61d7db1) 74.43694%.

Additional details and impacted files

@@                 Coverage Diff                 @@
##              master        #576         +/-   ##
===================================================
+ Coverage   74.40812%   74.43694%   +0.02882%     
===================================================
  Files              7           7                 
  Lines           1774        1776          +2     
===================================================
+ Hits            1320        1322          +2     
  Misses           367         367                 
  Partials          87          87                 

Impacted Files	Coverage Δ
pkg/outputter.go	33.50785% <100.00000%> (+0.70362%)	⬆️

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