Change default config of native_function_invocation

[dunglas]

According to the following comment of @nicolas-grekas, the default configuration of native_function_invocation should be changed to prepend a backslash only to functions that can be optimized by the PHP engine:

Adding more functions as opcodes would make the engine slower, because routing more opcodes requires more CPU. So this will not happen :)
The policy is to never add , except when it provides a significant advantage, i.e. for those special functions that php-cs-fixer/fabbot handle.

symfony/panther#61 (comment)

This PR changes the default config accordingly.

[dmvdbrugge]

Not sure if I personally agree to this, but if this is what's wanted, it's a bc-break so it has to target 3.0 not master.

[keradus]

Changing default configuration of rule is BC breaker indeed, @dmvdbrugge , good spot 👍

Sadly, I see sth wrong happen with this branch - I see lot of not related changes in diff.

[dmvdbrugge]

Probably because he just targeted the other branch, instead of rebasing first

[dmvdbrugge]

It also shows @keradus that you have not yet merged the 2.13 release into 3.0

[dunglas]

Sadly, I see sth wrong happen with this branch - I see lot of not related changes in diff.

I tried the "change base" button provided by GitHub, but it doesn't rebase automatically. This is fixed now.

[keradus]

Please update https://github.com/FriendsOfPHP/PHP-CS-Fixer/blob/3.0/UPGRADE-v3.md#changed-default-values-of-options as well, thanks !

[dunglas]

@keradus done

[SpacePossum]

sadly the tests are failure stopping this PR from being merged

[SpacePossum]

Thank you @dunglas.