Improve error handling & add some diagnostic output

[Vaiz]

Hi tigros,
I've introduced some enhancements to streamline the debugging process in this pull request. I hope you'll find these changes beneficial, or at least some of them.

Changes:

• Added error message if main.exe encounters errors. It includes the output from the application.
• Added exception for cases where totmem is less than usedMem.
• Added exception if no performance counters are found.
• Disabled the goButton until performance counters are initialized. Initialization takes quite some time, and I managed to start transcription before counters were initialized.
• Renamed certain elements to better reflect their roles and responsibilities.

#60