Release 0.9.4

Increased version to 0.9.4

Release 0.9.3

Increased version to 0.9.3

Release 0.9.2

Release 0.9.2

Release 0.9.1

Moved virtual functions back into header files.

Increased version to 0.9.1

Release 0.9.0

Changed to use std::array.

Added templated filters for selected filter classes.
Increased version to 0.9.0

Release 0.8.2

Standardized function names and parameters.

Increased version to 0.8.2

Release 0.8.1

Changed from using uint32_t loopTimeUs to float  loopTimeSeconds.

Increased version to 0.8.1

Release 0.8.0

Changed from using uint32_t loopTimeUs to float  loopTimeSeconds.

Increased version to 0.8.1

Release 0.7.0

Added circular buffer.

Increased version to 0.7.0

Release 0.6.1

Increased efficiency of BiquadFilter, especially setNotchFrequency().

Whitespace tidy.
Added test code.
Increased version to 0.6.1