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Extend all mode filters so that they handle >1 mode.
For instance, if the users want to filter all buffers in
C or C++ mode, then they can call the filter interactively
with input: 'c-mode,c++-mode' (Bug#32731).

* lisp/ibuf-macs.el(define-ibuffer-filter): Add key :accept-list.
If the value of this key is non-nil, then the filter accepts
either a single qualifier or a list of them; in the latter case,
the resultant filter is the `or' composition of the individual ones.

* lisp/ibuf-ext.el (ibuffer-filter-by-used-mode)
(ibuffer-filter-by-mode, ibuffer-filter-by-derived-mode)
Set :accept-list value non-nil.
Interactively, accept a comma separated list of mode names.

* etc/NEWS(Ibuffer): Announce this change.
Co-authored-by: Noam Postavsky <npostavs@gmail.com>