More migrating to properties.

sources/PTYTab.h

@@ -177,14 +177,13 @@
            vSpacing:(double)vs;
 // Size we should report to fit the current layout
-- (NSSize)tmuxSize;
+@property (readonly) NSSize tmuxSize;
 // Size we are given the current layout
-- (NSSize)maxTmuxSize;
-- (NSString *)tmuxWindowName;
-- (void)setTmuxWindowName:(NSString *)tmuxWindowName;
+@property (readonly) NSSize maxTmuxSize;
+@property (copy) NSString *tmuxWindowName;
 - (int)tmuxWindow;
-- (BOOL)isTmuxTab;
+@property (readonly, getter=isTmuxTab) BOOL tmuxTab;
 - (void)setTmuxLayout:(NSMutableDictionary *)parseTree
        tmuxController:(TmuxController *)tmuxController;
 // Returns true if the tmux layout is too large for the window to accommodate.