Merge with trunk

util.sasl.plain: Allow empty authzid (thanks bjc).

util.hmac: Optimized.

util.sasl.scram: Optimized binaryXOR.

util.sasl.scram: Fixed a variable redeclaration.

modulemanager: Fire events module-loaded and module-unloaded, both receive a table with 'module' and 'host' fields, thanks bjc

util.sasl.scram: Making =2D and =3D substitution actually work.

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