No need to set sy.argv anymore
Add find_non_virtual_methods
Disable highlighting on demand

This still computes the ranges. It just doesn't show them.
Extract configuring the correct clang library
Read clang library path from file
Rename libclang.py to clang_plugin.py
Remove lenghty comment
Remove print_cursor_with_children
Remove commented-out code
Move abort_after_first_call to common