fix wire position getters
BaseAudioNode interface for (dis)connecting audio nodes
implement getAudioInletAt on Output and Oscillator nodes
move port and wire constants to main data file
fix incorrect port top offset
add node value setter
implement gain node with node canvas
implement delay node
update hslider styles
add method to transmit value change
add interface for requesting preferred params
implement getPreferredParams on Gain and Delay
implement hslider functionality
add vertical slider
fix typo in prop name
implement oscillator methods