Lazarus 0.9.26 release preparation

The list of open issues for Lazarus 0.9.26 is getting smaller by the day. Most are fixed. Some are re-targeted to 0.9.28, if we estimate it takes too long fix them now. Some are re-targeted to 1.0.0, if closer inspection turns out the bug is not a regression. Some issue are in the status feedback. [...]
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