core: hook up all the inspector activation state and such

src/renderer/State.zig

@@ -2,6 +2,7 @@
 
 const std = @import("std");
 const Allocator = std.mem.Allocator;
+const Inspector = @import("../Inspector.zig");
 const terminal = @import("../terminal/main.zig");
 const renderer = @import("../renderer.zig");
 
@@ -14,6 +15,10 @@ mutex: *std.Thread.Mutex,
 /// The terminal data.
 terminal: *terminal.Terminal,
 
+/// The terminal inspector, if any. This will be null while the inspector
+/// is not active and will be set when it is active.
+inspector: ?*Inspector = null,
+
 /// Dead key state. This will render the current dead key preedit text
 /// over the cursor. This currently only ever renders a single codepoint.
 /// Preedit can in theory be multiple codepoints long but that is left as