fusion of all configuration files in configuration_config.yml

[AcastaPaloma]

These are the current configuration files for the module upon installation:

classification_config.yml
general_config.yml
keyboard_shortcuts_config.yml
label_config.yml

Pull request includes deletion of four mentioned configuration files and addition of configuration_config.yml which includes their contents. Includes simplification of main file.

#68 states that these files are too confusing and should be regrouped into a single configuration file modifiable by the Configuration Window upon startup of the module.

Pull request should be tested to see if any errors come from not being able to access the new configuration_config.yml

There is a known bug in this pull request that opens up two SlicerCARTConfigurationSetupWindows after Configure segmentation... is clicked.
See screenshots for more information regarding the reproduction of this bug:

First step

Second step

Add labels, toggle the timer checkbox, etc. **Then click on Apply**

Third step

Two configuration windows appear for no apparent reason. The issue is not reproducible when Configure classification... is clicked on step 1 instead of Configure segmentation...

[AcastaPaloma]

I have a feeling that this problem is with Qt and Slicer itself. The logic itself to handle window opening and closing is often not robust on my side - windows open & load slowly, windows will close and open inconsistently, etc. Maybe an issue with the fact that I'm using Windows?

[AcastaPaloma]

Issue fixed. There were two lines of code connecting to the opening of the ConfigurationSetupWindow. Code fragmentation is a top priority as this issue could have been resolved much easier with easier legibility.

[maxradx]

issue 35. Multiple configuration files merged into 1 configuration file. Works fine. Thanks to Kuan.