* test: add TransmissionTest fixture that calls tr_lib_init()
* refactor: use std::call_once() in tr_lib_init()
* test: ensure quarks are sorted in RpcTest::sessionGet
* refactor: use ::libtransmission::test::TransmissionTest
prefer this over ::testing::Test to ensure tr_lib_init() is called once
* Use imported CMake target for CURL
* Use imported CMake target for fmtlib
* Use imported CMake target for WideInteger
* Use imported CMake target for FastFloat
* Use imported CMake target for UtfCpp
* Use imported CMake target for Threads
* Use imported CMake target for Iconv
* Use imported CMake target for crypto backend
* Use imported CMake target for GTK
* Use imported CMake target for Qt
* Use imported CMake target for deflate
* Use imported CMake target for libevent
* Use imported CMake target for natpmp
* Use imported CMake target for miniupnpc
* Use imported CMake target for dht
* Use imported CMake target for psl
* Use imported CMake target for libutp
* Use imported CMake target for libb64
* Use include directories from libtransmission target
