Remove memmove from JBM code

Follow-up to #451 (closed)

• ..\lib_dec\jbm_jb4_circularbuffer.c(449): memmove( elements + i + 1, elements + i, ( size - i ) * sizeof( JB4_CIRCULARBUFFER_ELEMENT ) ); / IVAS_fmToDo: avoid use of memmove() */ -> Kacper
• ..\lib_dec\jbm_jb4_inputbuffer.c(237): memmove( h->data + insertPos + 1, h->data + insertPos, ( h->writePos - insertPos ) * sizeof( JB4_INPUTBUFFER_ELEMENT ) ); /* IVAS_fmToDo: avoid use of memmove() */ -> Kacper
• ..\lib_dec\jbm_jb4_inputbuffer.c(248): memmove( h->data + h->readPos - 1, h->data + h->readPos, low * sizeof( JB4_INPUTBUFFER_ELEMENT ) ); /* IVAS_fmToDo: avoid use of memmove() */ -> Kacper