Implement result directory tree handling and gathering of results

[mberz]

Results are saved on disk into the ReavenOutput folder.

Raven creates a folder structure based on the project name defined in the project file, the type of output data (i.e. ImpulseResponses), the date, and the time, followed by the receiver type (i.e. RIR, BRIR, etc.)

As an example:

RavenOutput:
├───Classroom
│   ├───Auralization
│   ├───ImpulseResponses
│   │   └───2021-09-17
│   │       └───11.39.35
│   │           ├───BRIR_AR
│   │           │   └───tmp
│   │           ├───BRIR_Combined
│   │           │   └───BRIR_Combined_PrimarySource0_Receiver0_1_1.wav
│   │           │   └───tmp
│   │           ├───BRIR_IS
│   │           │   └───BRIR_IS_PrimarySource0_Receiver0_1_1.wav
│   │           │   └───tmp
│   │           ├───BRIR_RT
│   │           │   └───BRIR_RT_PrimarySource0_Receiver0_1_1.wav
│   │           │   └───tmp
│   │           ├───Histograms
│   │           ├───PlaneWaveLists
│   │           ├───RIR_AR
│   │           │   └───tmp
│   │           ├───RIR_Combined
│   │           │   └───RIR_Combined_PrimarySource0_Receiver0_1_1.wav
│   │           │   └───tmp
│   │           ├───RIR_IS
│   │           │   └───RIR_IS_PrimarySource0_Receiver0_1_1.wav
│   │           │   └───tmp
│   │           └───RIR_RT
│   │           │   └───RIR_RT_PrimarySource0_Receiver0_1_1.wav
│   │               └───tmp
│   └───Visualization