checkwinsize is enabled by default since bash5.
It's not much hassle if enabled, but it's not necessary anymore and it conflicts if attempting to piggy-back on .bashrc with other kinda-compatible shells (e.g. osh).
bash5 is default for a couple of years already, and there is no bash4 in there at all
Replace individual setopt/unsetopt statements for history options with efficient
array-based loops. Also optimize history substring search key bindings using
the same pattern. Use lib.hm.zsh.define for consistent array formatting and
add unset statements to clean up temporary variables.
Signed-off-by: Austin Horstman <khaneliman12@gmail.com>