Split-off MetroFramework.Design

This was done to remove the dependency on System.Design.dll, which is
not included with the .NET Framework, Client Profile.

For VS to load the designer classes, these should ideally be registered
in the GAC. However, it is still possible to reference both
MetroFramework.dll and MetroFramework.Design.dll from a project and use
full design-time support. The reference to MetroFramework.Design.dll
should then be dropped by the compiler as it isn't necessary for
run-time support.
Small fixes
APTCA / added security attributes
Merge pull request #71 from thielj/master

Split-off MetroFramework.Design.dll
Some fixes

MetroForm: Header, max size
WinApi/WinCaret: Added [SuppressUnmanagedCodeSecurity]
Merge pull request #73 from thielj/master

some more small fixes
small changes on style manager and controls
recent fixes and placeholder (prompt) support for textbox
fixed combobox item rendering using a datasource
MetroStyleExtender (new), MetroStyleManager

Added MetroStyleExtender
Rewrote most of MetroStyleManager

Sven: Can you please review use of MetroStyleManager.Clone in
MetroTaskWindow!? It may not be ideal with owner, _parent, etc.
Merge pull request #74 from thielj/master

MetroStyleExtender / MetroStyleManager
refactored style extender / style manager and fixed maximize behaviour
fixed textbox tabstop behaviour
updated to version 1.2
added font fallback support for xp (open sans)
fixed maximize behaviour and style extender
fixed metro fonts
maximize form update
...
Merge branch 'master' of https://github.com/viperneo/winforms-modernui

Conflicts:
	MetroFramework.Demo/Properties/Resources.Designer.cs
	MetroFramework.Demo/Properties/Settings.Designer.cs
	MetroFramework/Properties/Resources.Designer.cs
	MetroFramework/Properties/Settings.Designer.cs