* wip?
* attempt to use weakptr
* apply posttask change to other balloon events
* chore: add clarifying comment on weakptr
* refactor: move weakptr include to implementation
(it's not needed in the header file)
* refactor: use default initializer for weak factory
* refactor: move weakptr usage outside of loop
* fix: convert mouse events as well
* refactor: use member function for balloon events
* fix: check if wicon is truthy in callback
* refactor: bind mouse events with member function
* refactor: inline lparams
* refactor: inline getkeyboardmodifiers()
* chore: correct GetKeyboardModifiers typo
* fix: systray icon demotion
Adding support for GUID parameter in Tray API.
In combination with signed binaries this allows to maintain
the position in the systray on Windows.
* unit tests
* make mac and linux compile
