mod_csi_simple: Add short reasons to report Should improve quality of debug logs

mod_csi_simple: Refactor to allow logging reason for buffer flush Same style as mod_mam and mod_carbons allows easy comparison. BC: Log format changes

mod_muc: let event handlers modify cloned presence Updates #1533

Fixes #1533 Hats don't get sent out to own MUC user

net.http: Return a Promise if no callback is given

mod_carbons: Clarify handling of error bounces The :find bit was hard to understand, this should be clearer.

mod_csi_simple: Don't consider presence errors as important A large share of `<presence type=error>` appears to be noise from large public channels and failed presence probes. The later at least should count as presence updates, which are currently considered unimportant. See also 8cecb85e4bc4 which is partly reverted here. The intent there was probably mostly about message (delivery) errors, which should be considered important.

MAM: Remove 1% of contents when reaching limits, fix #1545 With mod\_storage\_internal this counts out to 100 messages out of 10 000, meaning should not hit the quota limit immediately until that many messages have been added again.

util.pposix,signal: Pass around various OS numbers as integers [Lua 5.3] Passing around PIDs, UIDs etc as integers makes it more sane in Lua 5.3. Getting 1234.0 as PID is silly. Shouldn't change any behavior as these are all integers on the C side and the integral floats are accepted as integers when passed back from Lua into C.

mod_admin_telnet: Use tostring as fallback in pretty printing This has some nice effects such as functions, VirtualHosts and other things being printed using their `__tostring` metamethod.