Fixes#1833
This is an attempt to simplify the logic that has organically grown
convoluted over time with regards to how the titlebar and tab bar is
styled.
This field is one unified field that ONLY addresses titlebar and tab bar
styling. It can be one of "native", "transparent", or "tabs". The
"native" field is the new behavior in this commit: it makes the titlebar
and tab bar appearance be absolutely native. We do not color anything
(if we do its a bug).
The "transparent" option is the previous `macos-titlebar-tabs = false`
setting where the titlebar/tab bar is native but colored according to
the window background color.
The "tabs" option is `macos-titlebar-tabs = true`.
The `window-theme = auto` affect on titlebar appearance has been
removed. Now, the titlebar will NEVER be styled with "native" and MAY be
styled with "transparent" and will ALWAYS be styled with "tabs" (since
that's a totally custom look anyways).
Fixes#1802
This allows `keybind` configurations to map to any Unicode codepoint. This enables keybindings for which we don't have a registered keycode or for custom keyboard firmwares that may produce arbitrary text (but the Ghostty support is limited to a single codepoint).
The `keybind` syntax is unchanged. If a bound character doesn't map to a known logical key that Ghostty knows about, we map it to a Unicode codepoint. The unicode codepoint is compared against the _unshifted codepoint_ from the apprt key event.
Note that this binding is to a single _codepoint_. We don't support arbitrary sequences of characters or multi-code point graphemes for keybindings due to the complexity in memory management that would introduce.
This also provides a good fallback for scenarios where it might make sense to educate Ghostty about a key code or fix a bug in our keyboard input system, but the unicode data is correct. In that scenario, unicode key binds should allow key binds to still work while we investigate the input issues.
Example:
```
shift+ö=text:hello
```
This now works as expected on a US hardware keyboard with the Hungarian keyboard layout.
Add support for configurable fonts for window and tab titles. This is
only implemented for macOS (and could be macOS-only if other platforms
aren't able to support this using their windowing toolkits). It plays
nicely with regular and titlebar tabs.
We are also now using the `darken(by:)` implementation to generate
the split divider color on macOS, which means we'll have a consistent
rendering across iOS and macOS.
