* EnumProcessor.cs:
* GL2/Generator.cs:
* FuncProcessor.cs: Fixed handling of overrides file: we now add
signatures as requested and reset the stream after we are done
reading the file.
* Structures/Parameter.cs: Avoid qualifying IntPtr fully ((a) it's
unnecessary, since we have "using System;" already and (b) the
namespace qualification is not portable to C++).
Removed global enum, delegate and function collections.
Simplified loading process and removed global Initialize() methods.
Read "count" attributes for function parameters in overrides.xml.
Disabled wgl/glx/glu generators.
Removed large amounts of stale code.