Allow animated WEBP's (#1375)

* Don't merge layers when image is animated
* Update src/Drivers/Imagick/Encoders/WebpEncoder.php

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Co-authored-by: Oliver Vogel <oliver@olivervogel.com>

Avoid unnecessary exif_read_data calls (#1371)

EXIF data extraction makes only sense for JPEG and TIFF format. This
patch checks the format and calls exif_read_data only for appropriate
formats.

Previously, the function was also called with formats that can not
contain EXIF data. This resulted in warnings.

Fix typos

Merge pull request #1361 from Intervention/hotfix/cover-modifier-size

Fix bug in cover modifiers

Refactor line length calculation

Update code for phpstan level 6 (#1342)

* Update phpstan checks to level 6
* Add more details doc blocks to meet phpstan level 6
* Fix bug in building decoder chain
* Fix type hints

Add ImageManager interface (#1336)

Filter out parameter that do not match target encoder (#1333)

Filter out parameters/options that are passed to a format-unspecific encoder like AutoEncoder::class or MediaTypeEncoder::class but are not available in the format specific target encoder.

Adjust default parameter to main call in Image::class

Add doc blocks