Remove unused and / or broken code (#12935)
This PR removes the following:
- sysTreeView32 contains unused `TVItemStruct` - no idea what for (this code was there and was unused since 97a2fc65c31cb0718374e6df82b5eb5337b24b2f so for as long as this module).
- `MessageItem` class from the app Module for Outlook (last usages removed in #9603)
- `getPath` from the poedit appModule - this function was not used anywhere and in addition was broken (it references nonexistent variable `stopObj`
