feat: Support rendering 'Oblique' fonts (#236)

fix: Remove implicit conversion from float to int (#234)

Co-authored-by: Simon André <smn.andre@gmail.com>

fix: Leverage PHP 7.4 syntax (#226)

fix: Run CI on PHP 8.3 and fix deprecation notices (#211)

* fix: Deprecation notices

Removed deprecation notices for dynamic properties and implicit int conversions.

* chore(ci): Run CI tests on 8.3.

CI tests now run on 8.3 too, also readme now reflects support for 8.3.

fix: Apply defaults for cx, cy, rx, ry in EllipseRenderer (#210)

Fixed default ellipse properties according to SVG specification https://www.w3.org/TR/SVG2/geometry.html

chore: Remove tests from final zip file (#207)

* Remove tests from final zip file

* chore: Add comment to .gitattributes about export-ignore

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Co-authored-by: Fabian Meyer <3982806+meyfa@users.noreply.github.com>

fix: Default x and y to 0 in ImageRenderer (#206)

Fixes #189

test: Add a test case for RectRenderer defaulting x=0 and y=0 (#205)

Adds a test case for the fix in #204

fix: Parse CSS with duplicate selectors (#201)

fix: Allow renderer short-circuit if unable to render anything (#200)

The text renderer would previously throw in some circumstances if no
font was available. With this patch, its `prepareRenderParams()` method
can return `null` in these cases, aborting the render for that text
element without causing a crash.

This also simplifies RectRenderer, which doesn't need an "empty" state
anymore.