Transform exists with static build loader, and fix importing default

[maier49]

Type: bug

The following has been addressed in the PR:

• There is a related issue
• All code has been formatted with prettier as per the readme code style guidelines
• Unit or Functional tests are included in the PR

Description:
This replaces any calls to exists("feature") with true if that feature has been statically specified. It also fixes a bug discovered in the process which is that import { default } from 'somewhere/has' or import { default as whatever } from 'somewhere/has' were not being parsed.

Resolves #68

[codecov]

Codecov Report

Merging #145 into master will increase coverage by 0.18%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #145      +/-   ##
==========================================
+ Coverage    85.6%   85.78%   +0.18%     
==========================================
  Files          40       40              
  Lines        1723     1738      +15     
  Branches      430      441      +11     
==========================================
+ Hits         1475     1491      +16     
+ Misses        248      247       -1

Impacted Files	Coverage Δ
src/static-build-loader/loader.ts	100% <100%> (+0.63%)	⬆️

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