v3.0.8: Prevent external jQuery plugin errors from blocking script, support WP5.6

v3.0.8: improve interop, support WP 5.6 (#7)

* update latest supported version to 5.5.3

* move jquery dependency to second (init) script, load autosuggest in footer (lower priority)

* use jQuery in noconflict mode, avoid using jQuery ready hook: errors in other scripts that use it can stop our script executing

* lean on jq sugar and remove conditionals

* init script depends on autosuggest component script, more consistent script handle

* update readme files

* bump stable tag

Co-authored-by: Gaz Jessep <gareth@what3words>