Released libsidplayfp-2.9.0

Libsidplayfp (and its console frontend sidplayfp) is a C64 music player library which integrates the reSID SID chip emulation into a cycle-based emulator environment, constantly aiming to improve emulation of the C64 system and the SID chips.

Changelog:
* residfp: use c++11 threads for building filter tables
* residfp: code modernization and minor performance optimizations
* Performance optimizations

Also available sidplayfp-2.9.0

Changelog:
* Use correct freq table when using custom speed
* Updated filter presets from libSidplayEZ
* Capitalize filterRange6581 .ini parameter
* Fixed docs for -o option
* Reworked player logic, fixes looping