Add :bdelete command to FakeVim and/or configuration to control :quit

Hi.

I am using different IDEs (VsCode, PyCharm) and also Qt Creator on various projects. I've managed to standardize all editors using vi interface.

Unfortunately, in Qt Creator, command :quit closes the split instead of document (if we take other vi emulators for reference). I've solved my problem by mapping :bdelete command to Close action.

May I suggest to:

• Add default mapping for ^bd(elete)?$ to Close action
• Add configuration option to control how :quit should behave

One note. Command :quit closes split, but it should also close the document to match with vi behaviour.

Thank you!