- Fix file extension for new project
- Fixes for exceptions on MSW
- Fix some ASAN issues
- Allow SETTINGS_MANAGER to run headless
- Don't flag schematic as modified after schematic setup is closed
- Don't automatically unload projects when LoadProject is called
- Don't unload project if it's the same as the current one
- Make sure to properly init/de-init template field names
Set up a new lineage for SCH_ITEMS to get back to the SCHEMATIC
they live on: Items will all be parented to the SCH_SCREEN that
they are added to, and each SCH_SCREEN will point back to the
SCHEMATIC that it is part of. Note that this hierarchy is not
the same as the actual schematic hierarchy, which continues to
be managed through SCH_SHEETs and SCH_SHEET_PATHS.