* Changed shop purchase sound effects where Yum! definitely didn't fit. For alchemy, mage spells, and priest spells, I made the sound the same as the sound when you perform those actions. I figure this actually makes sense because the teacher would show you how to do the thing.
* For skill training, I made the sound be the same as leveling up. I think this makes sense.
* When something is too heavy to pick up, the "Argh!" labeled as 'Action Failure' in the editor sound picker makes a lot of sense--you tried to pick it up and were frustrated.
* I changed beep() so every platform just plays sound effect 1, the one labeled "low beep" [here](http://openboe.com/docs/editor/appendix/Sounds.html) that's labeled "Cancel target lock" in the editor picker. I think this reasonable.
* Removed `ding()` which was an unused alias for `beep()`
A way to set this flag is not yet exposed in the scenario editor.
The flag is intended only for non-stackable items, but this currently isn't enforced.
Items now have a maximum number of charges, which is equal to their default number set in the item record.
Enchanted items with charges are now rechargeable.
* DRY, standardized window top offset
* handle_splash_events() handle multiple events per frame
* accurate windows menubar height for multiple rows
* Windows filter a resize event triggered by the menubar
* windows expand small window to fit menubar
* splash screens draw in view rect, not window rect
- boost-spirit dependency needed to be installed
- Visual Studio wanted boost/filesystem.hpp included in more places
- a deprecated enum was removed from new versions of boost, so we use
its replacement enum now
- vcpkg repository is now pinned to a commit where boost 1.84 libraries
work smoothly, there should be no more surprises
- vcpkg dependencies now cache, so successive CI runs are dramatically
faster
- for win-scons, we need to use 'call' in our batch script to source
vcvarsall.bat
- I updated the includepath and libpath we pass to win-scons to match
reality, but it still can't find any vcpkg libraries. This will need
further sleuthing
