Split UI code into ly-ui library

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

ly-ui/src/root.zig

@@ -0,0 +1,16 @@
+pub const ly_core = @import("ly-core");
+
+pub const Cell = @import("Cell.zig");
+pub const keyboard = @import("keyboard.zig");
+pub const Position = @import("Position.zig");
+pub const TerminalBuffer = @import("TerminalBuffer.zig");
+pub const Widget = @import("Widget.zig");
+
+pub const BigLabel = @import("components/BigLabel.zig");
+pub const CenteredBox = @import("components/CenteredBox.zig");
+pub const CyclableLabel = @import("components/generic.zig").CyclableLabel;
+pub const InfoLine = @import("components/InfoLine.zig");
+pub const Label = @import("components/Label.zig");
+pub const Session = @import("components/Session.zig");
+pub const Text = @import("components/Text.zig");
+pub const UserList = @import("components/UserList.zig");