Add the capability for LLDB to query an arbitrary Python module (passed in as...

Add the capability for LLDB to query an arbitrary Python module (passed in as a file path) for target-specific settings
This is implemented by means of a get_dynamic_setting(target, setting_name) function vended by the Python module, which can respond to arbitrary string names with dynamically constructed
settings objects (most likely, some of those that PythonDataObjects supports) for LLDB to parse

This needs to be hooked up to the debugger via some setting to allow users to specify which module will vend the information they want to supply

llvm-svn: 192628