Migration 0.0.X to 0.1.0

There have been some substantial changes between versions 0.0.1+ to 0.1.0.

Code has been split out into new projects. The most important changes are:

• PdfPoint, PdfRectangle and PdfLine move from UglyToad.PdfPig.Geometry to UglyToad.PdfPig.Core.
• PdfDocumentFormatException moves from UglyToad.PdfPig.Exceptions to UglyToad.PdfPig.Core.
• UglyToad.PdfPig.Export classes move to a new project and namespace UglyToad.PdfPig.DocumentLayoutAnalysis.Export.
• TextBlock and TextLine move to UglyToad.PdfPig.DocumentLayoutAnalysis.