macosx: remove previous crash log reporting mechanism
macosx: add and deploy QuincyKit for crashlog reporting

This is for evaluation only. We might want to revert to our previous system for the release.
macosx/QuincyKit: minor tweak so we can set our own app versions if needed
macosx/QuincyKit: add l10n
macosx/QuincyKit: fix a few compilation warnings