win32 toolchain based on MinGW for ownCloud Client 2.4 (and later) with Qt-5.9.3

When creating a new stable branch:

- Make sure to copy the project config (Advanced -> Project Config)
Best use from

- Copy all packages that are in this project from windows:mingw:win32, except for
* Qt packages
* mingw32-cross-nsis-plugin-uac
Those need to be copied from this repo.

- run from

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