feat: Web page screensaver

[yoho0623]

Add deepin-web-screensaver subroutine.
Support users to use custom web pages as screensavers.

Log: Add web page screensaver options

[deepin-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: yoho0623

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[deepin-ci-robot]

deepin pr auto review

Update screensaver to support web screensaver

[deepin-bot]

TAG Bot

New tag: 5.0.20
DISTRIBUTION: unstable
Suggest: synchronizing this PR through rebase #88

[deepin-bot]

TAG Bot

New tag: 5.0.21
DISTRIBUTION: unstable
Suggest: synchronizing this PR through rebase #93

[deepin-bot]

TAG Bot

New tag: 6.5.0
DISTRIBUTION: unstable
Suggest: synchronizing this PR through rebase #95

[deepin-bot]

TAG Bot

New tag: 6.5.1
DISTRIBUTION: unstable
Suggest: synchronizing this PR through rebase #101

[deepin-bot]

TAG Bot

New tag: 6.5.2
DISTRIBUTION: unstable
Suggest: synchronizing this PR through rebase #103

[deepin-bot]

TAG Bot

New tag: 6.5.3
DISTRIBUTION: unstable
Suggest: synchronizing this PR through rebase #116

[deepin-bot]

TAG Bot

New tag: 6.5.4
DISTRIBUTION: unstable
Suggest: synchronizing this PR through rebase #118

[deepin-bot]

TAG Bot

New tag: 6.5.5
DISTRIBUTION: unstable
Suggest: synchronizing this PR through rebase #120