Release/v3.33.1

[peaBerberian]

This is the PR for the v3.33.1 the last v3 release considered as latest on npm.

The official v4.0.0 will be released just after, and will mark our transition to a stable v4, now considered our main version.
v3 will still be maintained, and potential v3 releases may still be made (for bug fixes and minor improvements) under the legacy-v3 tag on npm.

To note that this release only brings minor bug fixes on top of the v3.33.0, none being regressions (those issues have been here since the corresponding features have been introduced). This reassure us that the v3 is stable enough for it to be reliable for people not having the time budget to make the switch to a v4 yet.

Left issues we know we have on v3 are:

• niche issues on Tizen (Samsung TVs).
  For example we are aware of some live pre-roll use cases with weird player behavior. This has been fixed in v4 but the ""fix"" (more of a work-around really) is too complex to be backported to the v3 easily. We would have to re-do the development and testing there, for what seems to be very rare issues just on Tizen TVs.

• The usual trail of DRM compatibilities issues.

  The "Encrypted Media Extensions" API allowing media decryption in a browser is notorious to break every other day on a random device when relying on specific configurations. Those issues come and go, sometimes they are fixed without any action on our part after a firmware update, other times we bring a work-around (on top of a work-around on top of a work-around, which may sometimes break legitimate use cases, yay!). Just yesterday we again noticed and fixed an issue arising in very specific conditions with the PlayStation 5 (we're trying a solution only for Canal+ applications for now).

  Most of those issues should be fixed in future v3 maintenance releases.

Changelog

Bug fixes

• dash: Don't unnecessarily reload external <UTCTiming> resources at each refresh if it failed for the first request of the Manifest [Don't re-load a Manifest's optional external resource each time if initial failed #1370]
• dash: The DASH_WASM feature do not rely on WebAssembly's sign-extension operators anymore as that is poorly supported on older Samsung and LG TVs [WASM: Temporarily rollback on wasm-opt dependency for release builds to make it work on some LG + Samsung TVs #1372]

Other improvements

• build: automatically install Rust and WASM toolchain locally if unavailable when building the RxPlayer WebAssembly file
• doc: Update our documentation generator and fix all invalid anchors in it
• npm: prevent the publishing of unnecessary files on the npm registry [chore: update .npmignore to only publish relevant files #1377, Clean dist directory when calling build:all script #1378]