Code like `if ({$x}) {} else if ({$b}) {}` was replaced with
`if ([]) {} else if ([]) {}`, which ESLint reported as a duplicate
condition error. Using unique placeholders `[1]`, `[2]`, etc.
avoids these false positives.

Counter resets at the start of each preprocess() call.

This release's headliner is a new OptimizeGlobalCallsSniff that automatically
generates grouped `use function` / `use const` statements for global calls — eliminating
runtime namespace fallback overhead and unlocking PHP compiler optimizations. Alongside it,
presets can now be fixer-only or sniffer-only without causing errors.

`<?php declare(strict_types=1);` is now allowed on the opening line.