add support for sample rates different to 48kHz (#15)

- instead of storing chunk duration in ms store the frame count
  and do calculations based on that
- add updated snapserver.conf for reference (#17)
- some code clean up
- move Kconfig entries to correct place
- remove unnecessary Kconfig entries
- add necessary dependencies in Kconfig files

Signed-off-by: Karl Osterseher <karli_o@gmx.at>

components/dsp_processor/include/dsp_processor.h

@@ -39,7 +39,7 @@ typedef struct pnode {
   struct pnode *next;
 } pnode_t;
 
-void dsp_setup_flow(double freq, uint32_t samplerate, uint32_t chunkDurationMs);
+void dsp_setup_flow(double freq, uint32_t samplerate, uint32_t chunkInFrames);
 int dsp_processor(char *audio, size_t chunk_size, dspFlows_t dspFlow);
 void dsp_set_xoverfreq(uint8_t, uint8_t, uint32_t);
 void dsp_set_vol(double volume);