Flash producer

Flash producer
    - globally serialize initialization and destruction of flash players, to avoid race conditions in flash.
    - changed so that the flash buffer is filled with flash player generated content at initialization instead of empty frames.

OSC
    - merged OSC improvements #152 made by Robert Nagy up until commit https://github.com/ronag/Server/commit/bae86d21f1569b4b7ac1e08c024d62f389efa57e
    - enclosed multiple OSC messages in the same UDP packet inside an OSC bundle to comply with OSC spec
    - ensured that UDP packets are not too big (causing fragmentation, and errors on OSC receiving side)
    - removed use of Microsoft Agents library which seemed to be the cause of running out of memory after a while. Now everything is done synchronously instead (without support for multiple targets, just a single target (parent) for now).