Add Optional Cursor Properties to Color Schemes

There are several fields assigned against profiles that feel like they would be better placed in schemes (or at least duplicated to schemes):

• cursorColor
• cursorShape
• fontFace
• fontSize

There are two options for these properties that could be utilised:

1. Remove them from the profile and add them to schemes, updating the current schemes with default values.
2. Leave them in the profile and have them act as an override when present, similar to what background is doing currently.

Additionally, it may be worth actually removing the default background value, to allow the theme background to actually work by default.