Also added a newline after </style>

-Use "long form" font specification for the style SVG (fixes problems
 with GIMP and Inkscape)
-Put the style code higher up in the output legend SVG -- has the
 effect of applying the rect stroke to the topmost legend rect, which
 was a problem in Inkscape but not in chromium (:thonk:)
-Add note about GIMP choking on dominant-baseline (tldr not worth
 worrying abt now i think)

(the text styles are now across multiple lines)

similar to what we do for categorical export

make life less painful (tm)

Now, things are split up into a "Solo" and "HTML" SVG -- the gradient
shown on the page is a combo of these, and the one we export is just
the Solo one. This makes scaling it properly for the export SO MUCH
EASIER AHH

All we gotta do now is just add in value text and update rowsUsed /
maxLineWidth. think that should be good?

oh also this is gonna explode the tests ofc. that is a job for TOMORROW
MARCUS (tm)

IT WORKS SO WELL AOGIHDSOIGHJ

something worth noting: there seems to be some unaccounted-for
horizontal padding on the right side in the cat legend export.
i matched it in the continuous legend export b/c it looks nice but
worth looking into...?

it looks like things are the opposite from how i thought -- looks like
the perceived extra space was just due to the boldfont used in
estimating the texts (when you make the text bold it's almost snug
with the border on the right side). may as well add the same padding
as for the continuous legends so things look consistent ish.

Still, this leaves it kinda unclear as to why continuous legends were
so comparatively snug with the border until i added padding ... maybe
boldface numbers are just not that bigger? idk

UPDATE: yeah i checked it and bold numbers are basically the same size
but bold letters are much larger. mystery solved 💯

looks not great (gotta align max and min headers like in table)
but good enough tm

…k-fixes

…k-fixes

Actually not that bad. wack.

removes line in the middle

Need to use paths for circular barplot curves, and maybe better
stuff for rect barplots. but it works :D

since default is 1

shoutouts to https://stackoverflow.com/a/53309814/10730311.

this is very easy to configure (just a line in the svg header),
so if users prefer different things we can document this.

…k-fixes

export is broken (height is somehow nan?) but at least this works now

still broken but much less so

fixes things! hey this works now

previously they were showing up in the SVG, probs due to precision
pbms. should beo k now

still gotta test, tho, which will likely need to be deferred until
after fixing the other pbms with this pr and tests .______.

is safer -- delegates checking that colorer is continuous to, well,
colorer.

At least for cat legends -- no longer do we have to worry about
rows and units and all that. each legend just returns its width and
height, and that's all we care about.

…k-fixes

addresses a comment from @kwcantrell

addresses @kwcantrell comment. Required breaking up the barplot
drawing stuff into a separate function that returns the coords

tldr gotta reverse the stop colors. reason this worked _before_ was
that it was accessing the interpolator to build up the stop colors

Addresses @kwcantrell comment.

…k-fixes

knock on wood