Set meaningful defaults for settings

[JonatanPlesko]

We currently have two settings - Content wrapping and Blob preview. By default, Content wrapping is off, and Blob preview uses a placeholder. I believe we would cover more use-cases by setting those defaults to something different.

1. For content wrapping, having over 100 lines in a single cell is likely undesirable in the vast majority of cases. My personal preference would be something like 10, but it should definitely be on by default no matter the value. A 100 lines seems way too much BTW.
2. A placeholder for blob preview doesn't allow for the data to be read, while UTF-8 only works when the blob is encoded as such. I believe we should use either hexadecimal or base64. Between the two, hex seems like a better option as Base64 doesn't allow for an easy inspection of individual bytes.

Keep in mind defaults are very important as it is common in development to delete data/reinstall the app, so the settings are constantly being reset to default. Maybe we could even move the settings to Gradle to make them persist, but not sure if that is an overkill or not.