Update Events

When attempting to run 1000 miles, we soon noticed that it *could* draw to its windows, but it didn’t because we didn’t send update events to the application. As Window Manager implementation had already added foundation for posting the update events, we added support for it in the EventAvail/GetNextEvent, and stuff started happening.

After adding BeginUpdate, EndUpdate, and a bunch of other traps 1000 miles needed, such as PlotIcon and Pack7 (DecStr68K) package (for NumToString through LBin2Dec), we got nice looking interface of the game visible:

Update Events working; 1000 miles windows have now content