Stop bundling pycanberra
It came to my attention that pycanberra is LGPLv2 only, while IBus Cangjie is LGPLv3+. The mix of the two, bundled together might be problematic, so to avoid any issue, dropping our copy of pycanberra is the easiest way out. The code was already handling errors to play sound anyway (no sound would be played, so let's generalize that to the case where pycanberra is just not available.
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