C++: Fix Macrouse::utf16charsBegin()

This caused displaced highlighting of macro uses after #if constructs.

MacroUse::utf16charBegin() was based on the last "continuation token",
which was wrong.

Change-Id: I89983d82fcf804ba853c04a59a7533c489785d05
Reviewed-by: Erik Verbruggen <erik.verbruggen@digia.com>
Git: Native separators in GitClient::StashInfo::stashPrompt

Change-Id: I5090d8eb8f5e262785735ced81a12b9473721204
Reviewed-by: Orgad Shaneh <orgads@gmail.com>