DDG::Spice::Maps::Chains: proto.
DDG::Spice::Maps::Chains: update chains.txt.
Chains: move to building RE in core and exporting file to prevent using internal lib functions in ZCI-Spice.
Chains: add js file.
Chains: capture already happens upon re generation.
Chains (js): use places js. HT @russellholt
DDG::Spice::Maps::Chains: remove useless regex modifiers.
share/spice/maps/chains: remove function type check since placeholder code exists in spice.js.
Merge pull request #686 from duckduckgo/nilnilnil/chains

Add some major chain stores and restaurants.