v0.9.0

UPDATE: the release was broken, fixed now
This release is here to have something out before v1.0.0 but with all the new features mostly finished.

New features:

• Exponential SID-like improved ADSR
• Double-speed option
• SID filter support
• Experimental 6581-like filter mode
• Seperate filter curves for normal (8580) mode and 6581 mode
• Improved SID loading and playback, MoN songs work now
• More accurate C64 environment, mostly PSID compatible

Bugs:

• On older Rob Hubbard songs, the ADSR triggers 1-2 frames too late.
• On some songs, the pitch gets set 1 frame too late.
• RSIDs are broken (emulation not accurate enough)

There are also new example SIDs