Create initial window rules set up

At least tag rules seem to be working (but they're not frame perfect).

I might need to investigate more for float/no_float.

Rules are ANDed and only apply during window's first manage sequence,
so changing an appid/title doesn't affect anything.

src/main.zig

@@ -357,4 +357,5 @@ const log = std.log.scoped(.main);
 test {
     _ = @import("utils.zig");
     _ = @import("Config.zig");
+    _ = @import("globber.zig");
 }