xF2 Add-on SVG Template by Xon 1.6.1

• Fix issue using getSvgUrl/getSvgUrlAs in style properties with a template without an extension would cause CSS to fail to render
• Fix for race condition when creating temp files when encoding svg => png using resvg.
• Update README.md to link to updated precompiled binary for resvg (v0.14.1 => v0.23.0)

• Fix "XFCP_TemplaterHelper not found" error when upgrading the StandardLib add-on via the GUI
  • If this has happened, upload the files for this add-on. Then rebuild StandardLib add-on, then run the updater this add-on.

• Require XenForo 2.2+
• Require StandardLib v1.11.0+
  • Improve support for rendering templates in the mail & api contexts by correctly injecting template filters/functions into multiple rendering contexts
• Compat fix when zlib output compression is enabled for PHP8.0.17+/PHP8.1.4+

• Work-around for non-desirable caching behaviour when CloudFlare (or similar) is forced to cache svg.php output
  • Prevent polluting of caches if the time-stamp is in the future

• Support getSvgUrlAs('tenplate.svg', 'png') in style properties

• Reject attempting to save an SVG template with no elements

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• Require Standard Lib by Xon v1.1.0+
• Force usage of global functions so php can optimize them into special bytecode instead of function calls
• Fix disabling generating png links if svg => png is not configured
• Improve installer to report svg => svg conditions which can block usage
• Use "canonical" URL before XF2.2.3 as "full" doesn't work as expected in all contexts

• Add basic validation that an SVG template should render correctly
• Add an optimization pass for SVG's. Prunes pruning whitespace and nodes/attributes known to be safe to remove. Includes minifying any inline css.
• Support LESS/CSS in SVG's <style> element.
• Add option "Render SVG's as PNG for mobile devices", this supports rewriting calls to getSvgUrl from .svg to .png
  • Requires NulledTeam - Brower Detection v2.1.0+ add-on
  • Requires updating webserver URL rewrite urls to support PNGs
  • Caching requires explicitly defining a caching context with the name "sv-svg-img" or "css".
  • Supports Imagick or CLI executables as a back-end to render SVGs to PNGs.
    Using Imagick is not recommended
  • Example using resvg, as a CLI-executable back-end;
    /usr/local/bin/resvg --quiet {sourceFile} {destFile}
    This requires compiling using Rust, or use the pre-compiled linux x86_64 binary here.
    Compiling can be done with;
    
    Code:

    curl https://sh.rustup.rs -sSf | shsource $HOME/.cargo/env
    cargo install resvg
    cp ~/.cargo/bin/resvg /usr/local/bin/resvg
    chmod +x /usr/local/bin/resvg

• Minor code cleanup, avoid connecting to master redis instance to only connect to a replica instance on rendering cached output

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• Compatibility fix for Lazy Image loader add-on when Threadmarks Pro is installed

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