[Feature] Create RSS/Atom/JSONFeed from Daptin tables

[artpar]

WIP for Issue #30

• Can be useful for blog posts and other long text sharable stream of data.
• https://github.com/gorilla/feeds
• Feed template has 5 fields
• Author and Created At is already well defined
• Title, link and description to be mapped
• expose at /feed/.{json/atom/rss} (TBD)

[blackduck-copilot]

Black Duck Security Report

Merging #76 into master will not change security risk.

Click here to see full report

[codecov-io]

Codecov Report

Merging #76 into master will decrease coverage by 0.46%.
The diff coverage is 13.93%.

@@            Coverage Diff             @@
##           master      #76      +/-   ##
==========================================
- Coverage    37.3%   36.83%   -0.47%     
==========================================
  Files         100      101       +1     
  Lines       13235    13492     +257     
==========================================
+ Hits         4937     4970      +33     
- Misses       7780     7992     +212     
- Partials      518      530      +12

Impacted Files	Coverage Δ
server/resource/columns.go	73.91% <ø> (ø)	⬆️
main.go	8.33% <0%> (-0.11%)	⬇️
server/resource/dbmethods.go	39.21% <0%> (-0.46%)	⬇️
server/server.go	68% <100%> (+0.07%)	⬆️
server/feed_handler.go	14.13% <14.13%> (ø)
server/resource/streams.go	6.89% <16.66%> (+1.12%)	⬆️
server/resource/dbfunctions_update.go	55% <0%> (-0.83%)	⬇️
server/subsite.go	16.92% <0%> (-0.78%)	⬇️
server/resource/resource_create.go	54.35% <0%> (-0.61%)	⬇️
... and 1 more

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