Provide multiple lazy-loaded backends for SVGs#57

Merged

mykelk merged 2 commits intoJuliaTeX:masterfrom mirkobunse:master

Aug 19, 2020

+152-92

Commits on Aug 19, 2020

Lazy-loaded backends for converting PDFs to SVGs: pdf2svg, Poppler_jll, and dvisvgm
mirkobunse
committed
Fix test for Julia-1.0 by omitting Poppler_jll there
mirkobunse
committed