vesper_cmcp: Removed private functions stop, unbind, disconnect from public API.
vesper_cmcp: Merged functions start into connect and bind.
vesper_cmcp: Added dummy connection establishment method to client.
vesper_util: Moved vsp_util.h to private header files.
vesper_util: Corrected include syntax in vsp_error.h.
Moved time measurement methods from vesper_test to vesper_util.
vesper_util: Adapted vsp_time.c to coding style.
vesper_cmcp: Removed underscore prefix for private functions.

This is to avoid clashing with compiler internal members,
as members beginning with underscores are reserved by C standard.