Windows|Input: Enabled Qt mouse events for widget interaction

The normal Qt mouse events are used when mouse is untrapped.
Windows|Client|libgui: Adjusted fonts and font rasterizing

The text rasterization bitmap's width was one pixel too small. Also changed
the default Windows font.
Fixed|LogWidget: Rendering glitch related to atlas optimization

As the entry atlas is used in a dynamic fashion, defragmentation is needed
to free up fragmented space. However, if defragmentation occurs during the
rendering of entries, the generated geometry becomes obsolete as the UV
coordinates of all entries will likely change. Therefore, LogWidget needs
to redo the visible range of entries if the atlas is optimized.