Exceptions thrown by CanvasAPIviaLTI_Installer
MISSING_SECRETS_FILE
INVALID_SECRETS_FILE
MYSQL_CONNECTION
SECRETS_FILE_CREATION
SECRETS_FILE_APP
SECRETS_FILE_MYSQL
LTI_SCHEMA
LTI_PREPARE_DATABASE
LTI_CREATE_TABLE
APP_SCHEMA
APP_PREPARE_DATABASE
APP_CREATE_TABLE
API_STEP_MISMATCH
API_TOKEN
HTPASSWD_FILE
HTACCESS_FILE