#1541 Add Selection::SortedRanges()

[Zufu Liu]

Extract std::vector<SelectionRange *> selPtrs; building code from Editor::InsertCharacter() as Selection::SortedRanges(), and reuse it for Editor::CopySelectionRange() to make copied text for multiple selections sorted ([feature-requests:#1530]).

This change (eliminated one std::sort()) makes msvc x64 Scintilla.dll 4KB smaller.

[Neil Hodgson]

This includes both implementation changes and a behavioural change.

The change in behaviour stops the user being able to control the order in which a set of items is copied to the clipboard. This may be seen as a regression in functionality.

[Zufu Liu]

Renamed to OrderedRanges(bool sorted) and keep current CopySelectionRange() behavior.