DSP param read

[catfact]

should create an operator to poll DSP params (or update on DSP callback, see #244 )

(from this discussion thread: http://llllllll.co/t/aleph-reading-dsp-params-in-bees/2311/10 )

to be useful, would require small hack to the inputs page to show param names for an input corresponding to param index:
https://github.com/tehn/aleph/blob/dev/apps/bees/src/pages/page_ins.c#L78

[ghost]

ok so initially I can try and get string display up & running for op_param. Once that is done it should light the way how to improve grains' patch matrix...

[catfact]

as of 1608093 i'm calling this functional.