Split UI code into ly-ui library

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

ly-ui/build.zig

@@ -0,0 +1,37 @@
+const std = @import("std");
+
+pub fn build(b: *std.Build) void {
+    const target = b.standardTargetOptions(.{});
+    const optimize = b.standardOptimizeOption(.{});
+    const mod = b.addModule("ly-ui", .{
+        .root_source_file = b.path("src/root.zig"),
+        .target = target,
+        .optimize = optimize,
+    });
+
+    const ly_core = b.dependency("ly_core", .{ .target = target, .optimize = optimize });
+    mod.addImport("ly-core", ly_core.module("ly-core"));
+
+    const termbox_dep = b.dependency("termbox2", .{
+        .target = target,
+        .optimize = optimize,
+    });
+
+    const translate_c = b.addTranslateC(.{
+        .root_source_file = termbox_dep.path("termbox2.h"),
+        .target = target,
+        .optimize = optimize,
+    });
+    translate_c.defineCMacroRaw("TB_IMPL");
+    translate_c.defineCMacro("TB_OPT_ATTR_W", "32"); // Enable 24-bit color support + styling (32-bit)
+    const termbox2 = translate_c.addModule("termbox2");
+    mod.addImport("termbox2", termbox2);
+
+    const mod_tests = b.addTest(.{
+        .root_module = mod,
+    });
+    const run_mod_tests = b.addRunArtifact(mod_tests);
+
+    const test_step = b.step("test", "Run tests");
+    test_step.dependOn(&run_mod_tests.step);
+}