Support setting shared data via XDG_DATA_DIRS and XDG_DATA_HOME #124
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In this PR, fcitx5-rime detect shared data using following logic:
If fcitx5-rime can find
rime-data/default.yaml
in$XDG_DATA_HOME
or$XDG_DATA_DIRS
(usingfcitx::fs::StandardPath::scanDirectories
), it will use it . Otherwise, it useRIME_DATA_DIR
specified during build time as fallback.