Reopen window in maximised state (windows)
Ignore
Revert "Ignore"

This reverts commit 7e3d8dcaaf5cd517f37e4686adfd34c10a74229d.
Change to use Qt saveState & restoreState

Should work on Win, Mac & Linux.
Merge pull request #1002 from jonbev/WindowsWindowState

Reopen window in maximised state (windows)
merge upstream into master