Instead of creating a single command for EVERY resource, just
build up a single command for ALL the resources.
This avoids thousands of lines of output when compiling, where
we get one line per resource file. Eg:
[890/11818 452.2/sec] Generating ../../output/data/svg/sport/sport_snooker.svg
[891/11818 451.8/sec] Generating ../../output/data/svg/sport/sport_soccer.svg
Since we're installing thousands and thousands of resources
(eg the svg symbols, cpt color ramp data, etc), this is all
just noise. And it's especially annoying on github runs where the
sheer length of the build log drags the whole page to a crawl!
This change reduces the total steps from ~11800 (as above), to
~5900
