* Dekstop,CLI: enex_to_md: add html/md test file pairs
* one pair for basic text formatting tags: strong, b, i, em
* and one using span tags with inline styles for bold formatting
Note: The html files include the Evernote-typical "linebreak tags inside of separate <div> tags"
to represent empty lines!
* Desktop,Cli: enex_to_md: support bold in span tags using inline styles
* function isSpanWithStyle() checks if further processing of a span tag
makes sense
* function isSpanStyleBold() checks if bold formatting via styles is
used - a similar function could be written for each span-inline-style-format
that should be supported
* Desktop,Cli: enex_to_md: fix saving span attrs in state object
pushing attributes of span tag to state object now
happens outside of isSpanWithStyle()
