Select a working execution function if disabled functions are present

[cli-ish]

I just read the README.md file which says that every PR should have a issue before it is created. Since I have already created the PR, I will still explain why this is a good improvement.

Some servers disable functions for security reasons, but leave some open because they don`t know them or use only certain functions.
For these cases, the exec function could be blocked, but shell_exec could be allowed. So the idea would be to go through a list of possible aqiuvalente so that we can still execute commands.

My PR
#31

Again i am sorry, that i did the order wrong :)

[flozz]

Thank you for this improvement, you are right it is a very good idea to test multiple way to run commands :)

Again i am sorry, that i did the order wrong :)

no problem ;)

[flozz]

The PR was merged and released as v2023.05.10 :)