v3.1.1

#1133 Fixed syslog regression.
#1138 Fixed multiple network bugs.
#1141 Fixed log in background mode.
#1142 RandomX hashrate improved by 0.5-1.5% depending on variant and CPU.
#1146 Fixed race condition in RandomX thread init.
#1148 Fixed, on Linux linker marking entire executable as having an executable stack.
Fixed, for Argon2 algorithms command line options like --threads was ignored.
Fixed command line options for single pool, free order allowed again.

v3.1.0

#1111 Added RandomX (rx/test) algorithm for testing and benchmarking.
#1036 Added RandomWOW (rx/wow) algorithm for Wownero.
#1050 Added RandomXL (rx/loki) algorithm for Loki.
#1077 Added NUMA support via hwloc.
Added flexible multi algorithm configuration.
Added unlimited switching between incompatible algorithms, all mining options can be changed in runtime.
#257 New logging subsystem, file and syslog now always without colors.
#314 Added donate over proxy feature.
#1007 Old HTTP API backend based on libmicrohttpd, replaced to custom HTTP server (libuv + http_parser).
#1010 Added daemon support (solo mining).
#1066 Added error message if pool not ready for RandomX.
#1105 Improved auto configuration for cn-pico algorithm.
Added commands pause and resume via JSON RPC 2.0 API (POST /json_rpc).
Added command line option --export-topology for export hwloc topology to a XML file.
Breaked backward compatibility with previous configs and command line, variant option replaced to algo, global option algo removed, all CPU related settings moved to cpu object.
Options av, safe and max-cpu-usage removed.
Algorithm cn/msr renamed to cn/fast.
Algorithm cn/xtl removed.
API endpoint GET /1/threads replaced to GET /2/backends.
Added global uptime and extended connection information in API.
API now return current algorithm.