Enhancement: Do not save window size (remove schema)
Closes #82 (closed)
This MR removes the feature remembering the previous window size.
In the process, the gschema
was removed since it isn't needed anymore.
If we later need settings again, this allows us to change the schema path from /com/vixalien/decibels/
without losing any user options in the process.
This should also allow us to implement !73 (closed) more easily.
As the default size, 650×450 was chosen.