support C++ iqdb sql schema

only use masks if cpu supports avx512f

compile docker image with cpu optimizations

delete existing ids on upload and respond with post_id

lib: use builtin const Packed::BITS

lib: make DB.image_count() ignore images marked as deleted

use a single id instead of id, post_id

use post_id instead of id

feat(server): add Dockerfile

feat(server): add signal handler

fix(server): respond with same format as original iqdb for queries

server: return ImageData when adding images

set status code on responses

remove -h from help arg

server: split into multiple files

add limit arg to query