refactor function file names

pacman_mirrors/dialogs/consoleui.py

pacman_mirrors/functions/configFn.py

pacman_mirrors/functions/consoleFn.py

pacman_mirrors/functions/customFn.py

pacman_mirrors/functions/fileFn.py

pacman_mirrors/functions/httpFn.py

pacman_mirrors/functions/jsonFn.py

pacman_mirrors/functions/validFn.py

pacman_mirrors/mirrors/mirrorfn.py

pacman_mirrors/pacman_mirrors.py

scripts/pacman-mirrors

scripts/pacman_mirrors

share/mirrors.json

share/org.manjaro.pkexec.pacman-mirrors.policy

tests/test_command_line_parse.py

tests/test_default_config.py

tests/test_httpfn.py

tests/test_pacman_mirrors.py