True AeroShadow / FontResolver

AeroShadow now perfect in both 64 and 32 bit
Got rid of DWM dependency - again compatible with Win XP
SystemShadow, DropShadow and FlatShadow working well, too.
Added MetroFramework.Fonts.dll and FontResolver

Known issue: Some of the animations (progress bar, spinner) don't run
with an active shadow window - they do run with SystemShadow or when the
window is maximised.