In FileManager::loadFileData method:
1. Fix unnecessary GCC crashes when opening larger files in 32-bit Notepad++ binary.
2. Take into account and report correctly also other possible Scintilla error states there (than the previously handled SC_STATUS_BADALLOC).
3. Catch and report correctly also exceptions not handled by the Scintilla exception handler.
4. Catch and report correctly also Notepad++ code exceptions there.
Fix#11103, close#11112