Add new MI commands, features and fixes to the lldb-mi driver.

- Can now load an executable directly as an argument.
- Fixes towards supporting local debugging.
- Fixes for stack-list-arguments, data-evaluate-expression, environment-cd, stack-list-locals, interpreter-exec.
- Fix breakpoint event handling.
- Support dynamic loading of libraries using the search paths provided by Eclipse.

llvm-svn: 215223