Use new API instead of old bulk download

[pitkant]

Addresses issues in #243 and #251. Thanks for everyone who reported problems!

• Added a parameter to get_eurostat() that makes it possible to download data from the new dissemination API (or continue to use the old bulk download facilities as long as they still work)
• Added new temporary functions that work with the new dissemination API
• Added the possibility of downloading datasets with multiple frequencies
• See NEWS.md for additional information

Any troubleshooting / testing / bug hunting is greatly appreciated!

[codecov]

Codecov Report

Merging #253 (ddb8996) into master (1c6086c) will increase coverage by 1.16%.
The diff coverage is 61.99%.

❗ Current head ddb8996 differs from pull request most recent head d327405. Consider uploading reports for the commit d327405 to get more accurate results

@@            Coverage Diff             @@
##           master     #253      +/-   ##
==========================================
+ Coverage   66.05%   67.22%   +1.16%     
==========================================
  Files          22       24       +2     
  Lines         769     1022     +253     
==========================================
+ Hits          508      687     +179     
- Misses        261      335      +74     

Impacted Files	Coverage Δ
R/get_eurostat_json.R	61.76% <ø> (ø)
R/get_eurostat_raw.R	76.47% <ø> (ø)
R/label_eurostat.R	54.65% <20.00%> (-33.13%)	⬇️
R/eurotime2num.R	61.36% <65.21%> (+61.36%)	⬆️
R/eurotime2date.R	54.87% <74.41%> (+21.54%)	⬆️
R/get_eurostat_raw2.R	77.77% <77.77%> (ø)
R/get_eurostat.R	52.45% <82.60%> (+12.03%)	⬆️
R/tidy_eurostat2.R	94.44% <94.44%> (ø)
R/tidy_eurostat.R	83.87% <100.00%> (+15.01%)	⬆️
... and 2 more

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[pitkant]

I ran devtools::check_win_release and devtools::check_win_devel tests. After fixing the few redirected or broken links there were no problems.