implemented ability to quick compare drawing command buffers using memcmp and decide whether to draw a new frame or not:   * added NK_ZERO_COMMAND_MEMORY macro   * when NK_ZERO_COMMAND_MEMORY is defined, inside     nk_command_buffer_push function there is an additional call     to NK_MEMSET after allocating memory for new drawing command
implemented ability to quick compare drawing command buffers
using memcmp and decide whether to draw a new frame or not:
  * added NK_ZERO_COMMAND_MEMORY macro
  * when NK_ZERO_COMMAND_MEMORY is defined, inside
    nk_command_buffer_push function there is an additional call
    to NK_MEMSET after allocating memory for new drawing command

OpenMusicKontrollers/moony.lv2,OpenMusicKontrollers/midi_matrix.lv2,OpenMusicKontrollers/sherlock.lv2,OpenMusicKontrollers/midi_matrix.lv2,OpenMusicKontrollers/sherlock.lv2,OpenMusicKontrollers/synthpod,OpenMusicKontrollers/moony.lv2,OpenMusicKontrollers/sherlock.lv2,OpenMusicKontrollers/midi_matrix.lv2,OpenMusicKontrollers/synthpod,OpenMusicKontrollers/patchmatrix,OpenMusicKontrollers/patchmatrix,OpenMusicKontrollers/midi_matrix.lv2,OpenMusicKontrollers/patchmatrix,OpenMusicKontrollers/moony.lv2,OpenMusicKontrollers/moony.lv2,OpenMusicKontrollers/sherlock.lv2,OpenMusicKontrollers/moony.lv2,OpenMusicKontrollers/patchmatrix,OpenMusicKontrollers/moony.lv2,OpenMusicKontrollers/synthpod,OpenMusicKontrollers/synthpod,OpenMusicKontrollers/synthpod