More integrations - PubSub, targets, logging, scheduling

• Add checks for Cloud Build email roles in cr_setup()
• Add direct Secret Manager environment args in builds via availableSecrets (#106)
• Add support for logsBucket in cr_build_yaml and cr_build_make
• Add cr_build_list() and cr_build_list_filter()
• Add cr_build_logs() and cr_buildtrigger_logs() and cr_build_logs_badger()
• Made Cloud Build status messages prettier
• Add messaging to cr_build_upload_gcs() saying where deploy folder is (#110) and clean up tar.gz folder correctly
• Add gcloud_args to cr_buildstep_run() and cr_run() and cr_deploy_run() to allow more customisation (#113)
• Add cr_run_schedule_http() to schedule Cloud Run HTTP calls (#113)
• Allow usage of cr_build_yaml() objects directly in cr_buildtrigger() without needing cr_build_make()
• Fix cr_deploy_pkgdown() error writing to file
• Allow escape_dollar in cr_buildstep_r() and cr_buildstep_bash() if you want to use Cloud Build substitutions in the script (#104)
• Allow direct support for Codecov (#116)
• Parse gar_Build objects to lists in buildtrigger responses so they can be more easily reused
• Fix bug with Cloud Run deployments not returning image names (#141 - thanks @engti)
• Added rscript_args to cr_buildstep_r() - (#128 - thanks @simonsays1980)
• All cr_setup_test() to be run without the interactive menu (#129 - thanks @muschellij2)
• Add cr_regions data that lists available Cloud Run regions (thanks @muschellij2)
• Allow specification of a target GCP project if it differs from the build project in cr_deploy_docker_trigger()
• Force lowercase for docker image names as they are only valid for kaniko in cr_deploy_docker_trigger()
• Fix bug parsing out listing build triggers in cr_buildtrigger_list()
• Fix paging issue sometimes returning NULL for cr_build_list() (#149)
• Update cr_deploy_r() to use PubSub/BuildTrigger as its default when scheduling (#148)
• Add support for running targets::tar_make() pipelines on Cloud Build via cr_build_targets() (#155)
• Rename cr_build_schedule_http() to cr_schedule_http() to be more in line with cr_schedule_pubsub() and cr_schedule_build()