Merge with 0.4.1

mod_posix: Integrate with loggingmanager, register syslog sink, remove redundant logging code

mod_posix: Remove pidfile on exit

core.loggingmanager: Refactoring, converted to a module. Now possible to register additional sink types (think syslog) from other modules

util.set: Add set.xor() to get a set consisting of items not in both sets

util.set: Add set:empty() to discover if the set is the empty set

util.set: Add metatable to sets to allow +, -, /, ==, tostring and to double as iterators

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