Add settings to control the icons used in Issues and PR tree views #6798
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Implements the feature request #6641.
Both tree views support an icon mode of
author(default),state, orgeneric.authorfollows the existing logic prior to this setting, where we attempt to fetch a rounded avatar. PRs fall back to a GitHub icon and Issues fall back to state-specific icon.statewill always use a state-specific icon that matches the Issue/PR type and state.genericwill always use the GitHub icon for a PR and an uncolored issues theme icon for Issues.