This allows to test against GTK 4 and Qt 6.
Changes to CMakeLists.txt files are non-functional and are meant to
trigger the components rebuild, nothing more.
* feat: add convenience variants of TimerMaker::create()
* refactor: use libtransmission::Timer in peer-mgr
* refactor: use libtransmission::Timer in peer-msgs
* refactor: use libtransmission::Timer in tr-utp
* refactor: use libtransmission::Timer in tr-dht
* refactor: use libtransmission::Timer in port-forwarding
* refactor: use libtransmission::Timer in webseed
* refactor: use libtransmission::Timer in tr-lpd
* refactor: use libtransmission::Timer in rpc-server
* chore: remove unused function tr_timerAdd()
* chore: remove unused function tr_gettimeofday()
* fixup! chore: remove unused function tr_timerAdd()
* fixup! refactor: use libtransmission::Timer in port-forwarding
