* generator/*.cs : Move into GtkSharp.Generation namespace.
* generator/CodeGenerator.cs (Main): Add usage check. Add SymbolTable.
* generator/EnumGen.cs (QualifiedName): New.
(Generate): Add SymbolTable to signature.
* generator/IGeneratable : Add QualifiedName prop and update Generate
signature.
* generator/Parser.cs : Switch from plain Hashtable to SymbolTable.
(Parse): Replaces the Types property and returns a SymbolTable.
* generator/StructBase.cs : New base class to derive struct and object
types. Initial implementation of protected GenField method and ctor.
* generator/StructGen.cs : New non-object struct type generatable.
* generator/SymbolTable.cs : New. Manages complex types hash and a
simple types hash. Will provide generic lookup interface.
svn path=/trunk/gtk-sharp/; revision=1855
