Fixes for Chrome v38

[wouterlucas]

Fixes for handling base64 src strings on Chrome v38, rework Image texture fallback & detection.

This PR includes:

• Using a 1x1 PNG pixel to determine which createImageBitmap signature is supported on the browser
• Fallback the image worker and main thread ImageTexture handling according to the detected signature
• Support for base64 src on Chrome v38
• Support for createImageBitmap(blob) without a config object for Chrome v50 (linked to fix: compatibility with chrome 51 #454)
• Support for ES5 legacy output of the examples directory (will be published on https://lightning-js.github.io/renderer/ automatically)
• Upgrade vite and vitest to 2.x devDependencies, pin to TS 5.6.x for now (as 5.7.x has issues with other dependencies)
• Upgrade Playwright 1.39 to 1.49 for automated tests
• Refactor Visual Regression test pixel matching and snapshot handling by using pixelmatch and pngjs over a homebrew detection + upng (which is stale).
• SDF font initialization waits for image support detection before uploading the SDF texture atlas.
• Added documentation on the fallback process and references to chrome versions in BROWSERS.md

[wouterlucas]

Using a 1x1 binary png pixel to detect if which createImageBitmap to handle chrome v50/51, small detour with eslint and dependencies to upgrade to newer vite legacy for es5 examples.