Windows build: ease the pain

[windelbouwman]

This issue aims to gather all troubles on windows when running lognplotgtk

Tasks:

• [x] Windows build procedure must be document
• [x] Several in app icons are missing on windows
• [x] Dragging a signal loses the mouse cursor
• [x] hdf5 support on windows
• [ ] lognplot icon is missing in the top-left corner of the windows window

Any other issues?

[windelbouwman]

Initial work has been put here