[deploy/env] restore -x behavior, deprecate --refresh

[get/artifact] add command

[docs] update deploy env docs

[diff/env] default output to yaml

[diff/env] add yaml and table output options

[push/chart] fix environment variables

[deploy/env] check for errors after mutex lock, fixes nuvo#9

rename annotation prefix

[deploy/env] validate default false

[deploy/chart] add validation flag