feat: improve detection of onwebkitplaybacktargetavailabilitychanged event

[Osb0rn3]

• Updated to handle 50 characters on-prefixed HTML attributes.
• Added new event handler for onwebkitplaybacktargetavailabilitychanged to Role ID 941160.

[fzipi]

Hi @Osb0rn3. As it says in the file here, can you update the source file first? Then please apply the crs-toolchain to generate the updated regexp.

[azurit]

@Osb0rn3 Ping.

[fzipi]

Tried to update the remote branch without success. Let's close this one as the reporter is not responsive. I'll try to address in a following PR.