Handle termbox2 errors

Signed-off-by: AnErrupTion <anerruption@disroot.org>

ly-ui/src/Cell.zig

@@ -14,8 +14,8 @@ pub fn init(ch: u32, fg: u32, bg: u32) Cell {
     };
 }
 
-pub fn put(self: Cell, x: usize, y: usize) void {
+pub fn put(self: Cell, x: usize, y: usize) !void {
     if (self.ch == 0) return;
 
-    TerminalBuffer.setCell(x, y, self);
+    try TerminalBuffer.setCell(x, y, self);
 }