Add Windows-CI.

[Hoikas]

This is based off the CI script I wrote for H-uru/PlasmaShop so we can have easy vault manager builds for Windows.

[zrax]

This is also missing another required (at least for Linux) change:

diff --git a/MoulKI.cpp b/MoulKI.cpp
index 1c3dfd1..e84249c 100644
--- a/MoulKI.cpp
+++ b/MoulKI.cpp
@@ -8,6 +8,8 @@
 #include "MoulKI.h"
 #include "ui_MoulKI.h"
 
+#include <Stream/plEncryptedStream.h>
+
 #include <QLabel>
 #include <QScrollBar>
 #include <QFileDialog>