Some of the SB API method description docstrings for swing are annotated
as `%feature("autodoc")` - but `"autodoc"` annotations are only to
substitute a string showing the arguments and return variables - either
in a single line, or in multiple lines. SBMemoryRegionInfo used
`"autodoc"` correctly describing the parameters and return type, but
then it added a description too which is not correct either.
Change all of these that are adding a method description to use
`%feature("docstring")` instead. There were a half dozen instances where
`"autodoc"` was correctly being used and we have overriden the parameter
and return types with a more readable version.
Instead of maintaining separate swig interface files, we can use the API
headers directly. They implement the exact same C++ APIs and we can
conditionally include the python extensions as needed. To remove the
swig extensions from the API headers when building the LLDB
framework, we can use the unifdef tool when it is available. Otherwise
we just copy them as-is.
Differential Revision: https://reviews.llvm.org/D142926
