Add Convenience functions

[dolanmiu]

Closes #638

[codecov-io]

Codecov Report

Merging #735 (502db14) into master (ef12ada) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #735   +/-   ##
=======================================
  Coverage   96.16%   96.17%           
=======================================
  Files         318      319    +1     
  Lines        3210     3217    +7     
  Branches      300      300           
=======================================
+ Hits         3087     3094    +7     
  Misses         79       79           
  Partials       44       44           

Impacted Files	Coverage Δ
src/convenience-functions.ts	100.00% <100.00%> (ø)
...ment/body/section-properties/section-properties.ts	93.93% <100.00%> (+0.09%)	⬆️
src/file/numbering/numbering.ts	92.59% <100.00%> (+0.28%)	⬆️
src/index.ts	100.00% <100.00%> (ø)

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