Unified Index Export

This page is to brainstorm on export capabilities of Tiki features that rely on the Unified Index, such as

But it doesn't cover previous generation code like PluginTrackerList and PluginTrackerFilter which already have an export parameter.

Source data

PluginList is obvious

Format: only .csv for now. We can perhaps add other later, like xlsx and ods
Which columns?
- Options: all (default, and immediate need)
- Later: what is show on page, and possibly configurable (a bit like Tracker Tabular).
Which rows?
- According to current filter. So if no filter if currently picked, all data is exported
- All rows should be exported, notwithstanding pagination on current view

What happens if too much data causes timeouts? Should there be a way to set a maximum? or to increase time allowed to generate? Or pre-generate reports in the back-end?