Rework cursor configuration

There are a couple of cursor-related options in the Alacritty config
file now, however they aren't grouped together in any way.

To resolve this a new `cursor` field has been added where all cursor
configuration options (besides colors) have been moved.

The `custom_cursor_colors` option has also been removed, since it's not
necessary anymore. Simply making the `colors.cursor.*` fields optional,
allows overriding the cursor colors whenever one of them is present.
Like that the user doesn't have to think about a relation between two
separate configuration options.

This PR initially put the `hide_cursor_when_typing` variable under
`cursor.hide_when_typing`. However this field is completely unrelated to
the cursor, but instead relates to the mouse cursor.

Since the word `cursor` is already used for the active cell in the grid
of a terminal emulator, all occurences of the word `cursor` when talking
about the mouse have been replaced with the word `mouse`.

The configuration option has also been moved to
`mouse.hide_when_typing`, to make it clear what this option is changing.

This fixes #1080.

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