Use int as the standard type for boolean options.

All options are accessed by passing char_u pointers around, casting the
pointer to the right pointer type for the specific option, and then
dereferencing that pointer.

This dance works fine on little-endian systems when some bool options
are int types (as in Vim) and some are bool types (as would make more
sense), but on big-endian systems *(int *)varp when varp is pointing to
a bool will read random memory.

Therefore, all boolean options must remain a consistent type and int is
currently the easiest to choose.

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