chore(deps-dev): bump xterm from 4.14.1 to 4.15.0

[dependabot]

Bumps xterm from 4.14.1 to 4.15.0.

Release notes

Sourced from xterm's releases.

4.15.0

🚀 Features

• Add support for focus reporting mode (#3506) via @​Tyriar
• Improve text alignment by setting text baseline conditionally by browser (#3370) via @​dstein64

📦 API

• Add API to clear canvas renderer texture atlas (#3481) via @​Tyriar
• Expose typed options via terminal.options (#3448) via @​silamon

🐞 Bug fixes

• Check type of cols & rows before resizing (#3532) via @​jeffg2k
• Maintain scrollbar visibility when width changes (#3504) via @​yume-chain
• Properly stop default browser scroll action via (#3518) via @​jerch
• Support text cursor enable mode in the DOM renderer (#3503) via @​jerch

📝 Documentation and internal improvements

• Improve InputHandler tests (#3523) via @​jerch
• Improve deserialize documentation (#3512) via @​Tyriar
• Add Mocha Test Explorer to devcontainer (#3479) via @​silamon
• Update npmignore files (#3476) via @​silamon

⚠️ Deprecations

Use term.options over term.setOption/getOption:

// before
term.setOption('rendererType', 'dom');
// after
term.options.rendererType = 'dom';

🎉 New real-world use cases

• goormIDE (#3495) via @​MyunghoBae
• FleetDeck (#3484) via @​JohanKnutzen

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📥 Addons

xterm-addon-serialize

• Support strikethrough (#3480) via @​silamon
• Enable granularity in what gets serialized (#3473) via @​Tyriar

... (truncated)

Commits

• e40cf80 Merge pull request #3544 from xtermjs/tyriar/length_warning
• 32cb95c Add warning to IBufferLine.length
• b206853 Merge pull request #3537 from jerch/update_deps
• b29d7d2 update to windows-2019 on azure
• b684929 upgrade dev deps
• 07ba3dc Merge pull request #3532 from jeffg2k/patch-1
• 5c9adee Check to make sure cols & rows are INT
• 394d7a2 Merge pull request #3370 from dstein64/master
• 987bb8d Merge pull request #3476 from silamon/cleanbuild
• ce31484 Merge branch 'master' into cleanbuild
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