GanttChart should feature Entry colors

Description

Goal:
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The user should have the option to customize a gantt entrys color.
So a GanttEntry implementation should be added which has a color member and features proper color rendering.
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Current situation:
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Only the default EntryRenderer (blue) is used.
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Suggested changes:
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Add a ColorGanttEntry implementation which features the mentioned goals.
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Environment

None
Duplicate

Assignee

JW

Reporter

JW

Labels

None

Components

Affects versions

Priority

Minor