Rename screenshot module to pngscreenshot

Less generic DLL name for distribution.

src/main.zig

@@ -4,7 +4,7 @@ pub const con = @import("console.zig");
 
 // Build options for conditional module compilation
 const build_opts = struct {
-    const screenshot = @import("build_options").enable_screenshot;
+    const screenshot = @import("build_options").enable_pngscreenshot;
     const interact = @import("build_options").enable_interact;
     const outline = @import("build_options").enable_outline;
     const worldmarkers = @import("build_options").enable_worldmarkers;

src/screenshot/screenshot.zig

@@ -98,7 +98,7 @@ var mutex: std.atomic.Mutex = .unlocked;
 var worker_running: bool = false;
 const mod_mutex = @import("../mutex.zig");
 
-pub const module_name: [*:0]const u8 = "screenshot";
+pub const module_name: [*:0]const u8 = "pngscreenshot";
 
 var g_mutex: ?HANDLE = null;
 var g_is_hook_owner: bool = false;