global: Rename client_connection_type to doveadm_connection_type

doveadm: Rename client_connection_type to doveadm_client_connection_type Move it to doveadm.h to allow plugins use doveadm-cmd.h

doveadm-server: Restructured client-connection code so that TCP and HTTP connection types are properly separated.

doveadm-server: tcp: Renamed client_connection_create() to client_connection_tcp_create().

doveadm-server: http: Renamed client_connection_create_http() to client_connection_http_create().

doveadm: Changed command contexts to contain the input, output, and connection type values directly. Before, it used a direct pointer to the connection. It used also flags to indicate the connection type, which is now consolidated in the connection type enum.

doveadm: Deliver remote logs over doveadm socket

doveadm-server: Refactor connection handshake and authentication Simplifies next change

doveadm-server: http: Fixed crash occurring when disconnecting a client at server deinit.

doveadm-server: Show incoming connection's IP and running command is process title.

global: unsigned int:1 -> bool:1 perl -i -pe 's/unsigned int ([^,:;]+):1;/bool $1:1;/' **/*.[ch]

doveadm: Implement HTTP server API, slightly based on JMAP API

doveadm: Changed most print formatters to write to ostream. This allows all the formatters to be used when sending replies to the upcoming doveadm HTTP server responses. The "table" formatter wasn't modified, because it writes to both stdout and stderr.

Changed type of internet port values to in_port_t everywhere. Created special SET_IN_PORT setting type for internet port values. Created net_str2port() for parsing internet port values. Removed several atoi() invocations in the process.

doveadm-server: Pass local/remote_ip/port to passdb lookups so proxy_maybe works.

doveadm-server: Added support for ssl listeners.

dsync: Added tcp:host[:port] target for syncing via doveadm-server.

doveadm: Added client/server architecture support for running mail commands. This is done when doveadm_worker_count is non-zero.