* build: clang-tidy headers when building libtransmission
* chore: revert `= default` workaround
It was introduced in 6909ec0bad to fix build issues with macOS 10.14. We
no longer support that version.
* fix: clang-tidy warnings for libtransmission
* build: clang-tidy headers when building tests
* fix: clang-tidy warnings for tests
* build: clang-tidy headers when building qt
* code review: don't manually edit mime-types.h
* code review: unify variable naming for static private members
* fix: warning: deleted member function should be public [modernize-use-equals-delete]
* fix: warning: variable has inline specifier but is implicitly inlined [readability-redundant-inline-specifier]
* fix: warning: enum uses a larger base type than necessary for its value set [performance-enum-size]
* fix: warning: initializer for member is redundant [readability-redundant-member-init]
* warning: parameter is const-qualified in the function declaration; const-qualification of parameters only has an effect in function definitions [readability-avoid-const-params-in-decls]
* refactor: add a Mediator class to decouple tr_session and tr_port_forwarding
* refactor: add tr_port_forwarding::Mediator::privatePeerPort()
* refactor: add tr_port_forwarding::Mediator::onPortForwarded()
* chore: avoid unnecessary include of timer.h in other headers
* refactor: use a uniform timerMaker() API in mediators
