LibPDF: Create basic object structure

This commit is the start of LibPDF, and introduces some basic structure
objects. This emulates LibJS's Value structure, where Value is a simple
class that can contain a pointer to a more complex Object class with
more data. All of the basic PDF objects have a representation.

Base/res/pdf/complex.pdf

@@ -0,0 +1,93 @@
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+  /Type /Page
+  /Contents [4 0 R]
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+  /Type /Page
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+  /Type /Page
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+1. 0.000000 0.000000 1. 50. 770. cm BT /F0 36. Tf (Page Three) Tj ET
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+endobj
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+<<
+  /Title (PDF Explained Example)
+  /Author (John Whitington)
+  /Producer (Manually Created)
+  /ModDate (D:20110313002346Z)
+  /CreationDate (D:2011)
+>>
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