Revert style changes

Fix one missed s/tab/space/

s/tab/space/ Remove empty lines

Style

more apr_file_write_full() simplification (like r1542413)

Fix various filter functions to return apr_status_t instead of int

remove unused function

Various code cleanup to avoid compiler, cppcheck, or clang warnings: modules/debugging/mod_firehose.c: Make some internal functions static (to do: logs_cleanup() is unused) modules/filters/mod_charset_lite.c: Remove dead assignments modules/filters/mod_include.c: likewise modules/metadata/mod_usertrack.c: likewise modules/proxy/mod_proxy_ftp.c: likewise modules/ssl/ssl_engine_pphrase.c: likewise modules/proxy/mod_proxy_balancer.c: likewise; Remove NULL check that can never happen modules/proxy/proxy_util.c: Axe NULL-check that can never happen and if it would, it would just mask another bug os/unix/unixd.c: likewise modules/http/http_filters.c: Remove sub-condition that is always true modules/lua/mod_lua.c: Add default cases to switch statements modules/generators/mod_autoindex.c: Unsigned value can never be < 0 server/util_expr_eval.c: Fix compiler warnings with VC and on OS2

mod_firehose: Ensure directives are defined global only.

mod_firehose: Support portable non blocking support, and make non blocking support optional.

Remove unused variable.

Fix the test for APR_HAVE_SYS_SYSLIMITS_H.

mod_firehose: Add a new debugging module able to record traffic passing through the server in such a way that connections and/or requests be reconstructed and replayed.