security: update symfony/mime and doctrine/annotations (#147)

chore: add explicit permissions to workflows (#129)

add doctrine/annotations dependency (fixes #117, via #127)

bump actions/checkout from 2.3.4 to 2.4.0 (via #80)

add issue templates

bump minimum required php version to 7.1.3 (fixes #61, via #66)

fix cdata steps (via #64)

migrate from single value to multi-value (via #58)

add custom labels (via #57)

merge labels in annotation manager (via #51)