global alerts for all functions

[martinlindenberg]

• [done] put global-alert.json in project folder
• [done] creates alerts accross all functions
• plugin decides if it only creates one alert for all functions (across all functions) or if it appends its rule to the functions alerts file (which is not required to be existent)
• configuration: all functions, functions per stages, function list,
• check if template variables within the functionname or path can be used