Support custom velocity context items during rendering

Description

Users should be able to provide their own custom velocity context items during rendering.

See plugin module description here:
https://developer.atlassian.com/confdev/confluence-plugin-guide/confluence-plugin-module-types/velocity-context-module

Environment

None

Status

Assignee

Unassigned

Reporter

Jens Rutschmann (K15t)

Labels

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Participants

None

Deployment

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Sprint

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Fix versions

Priority

Major
Configure