Adds a simple README.md
Fixes the link to the generator in the README.md
Fix the xml interface (better parser and typos).
Add compatibility for the old spec.
Widen the export list for the moment.
remove Read/Show for CompExtension.

Its use broke the interface, to make sure this would not happen again
it is moved to seperate methods.
Updates the datatypes from the old spec.
Remove the dependency on opengl-xmlspec
Switch to HXT as XML parser/writer.
Bump version after switch to HXT.
Merge branch 'master' into interfaceQuery