Last fret is cutoff with string names

[KCarlile]

Background

It seems that the last fret is getting cutoff when string names are enabled. On the examples page, the blank fretboard (example 1) renders correctly, but any other diagrams with string names enabled appears to have the last fret cutoff.

Acceptance Criteria

• All frets appear (including the last one) even when string names are enabled (and all other variations of config) ✅

Approach

• Check to make sure the last fret is being drawn properly
• Check to make sure that the calculated fretboard height is correct when string names are enabled

Notes

TBD

[KCarlile]

Created static stringNamePaddingFactor = 1.5; static global value that is used for padding the string name height. This needed to be added in multiple places, so the factor is defined once.

[KCarlile]

PR: #21