Allow file extension to be passed

Support gradients for slide background

Use regex to determine file extension

Add shadow options to image properties

…ted-dependencies

Fix vulnerabilities

Add image props - solidFill and fillOverlay

Fix shadow types: inner and none

Update dist

Add image blur

Allow external fonts to PPTX

adding fntdata file with spaces results into broken presentation

Remove spaces from fntdata filename

only override missing props on the text run, not just falsey ones

add pie chart explosion opt to charts

Return file size from writeFile fn