[add] Created new subproject sjplayer with the sfml test.

.gitignore

@@ -1,4 +1,5 @@
 .dub
 .bin
+dub.selections.json
 
 *.swp

.gitmodules

@@ -1,3 +1,6 @@
 [submodule "thirdparty/dast"]
 	path = thirdparty/dast
 	url = https://gogs.enigmatical.work/kajironagi/dast.git
+[submodule "thirdparty/gl4d"]
+	path = thirdparty/gl4d
+	url = https://gogs.enigmatical.work/kajironagi/gl4d.git

sjplayer/dub.json

@@ -0,0 +1,9 @@
+{
+  "name": "sjplayer",
+
+  "targetPath": ".bin",
+
+  "dependencies": {
+    "gl4d": {"path": "../thirdparty/gl4d"}
+  }
+}

sjplayer/test.d

@@ -0,0 +1,47 @@
+#!/usr/bin/env dub
+/+ dub.json:
+{
+  "name": "sjplayer",
+  "dependencies": {
+    "sjscript": {"path": "../sjscript"},
+    "derelict-sfml2": "~>4.0.0-beta.2"
+  },
+  "lflags-posix":   ["-L../thirdparty/dsfml/lib"],
+  "lflags-windows": ["/LIBPATH:..\\thirdparty\\dsfml\\lib\\"]
+} +/
+
+import std;
+
+import derelict.sfml2.audio,
+       derelict.sfml2.system,
+       derelict.sfml2.window;
+
+int main(string[] args) {
+  DerelictSFML2System.load();
+  DerelictSFML2Window.load();
+  DerelictSFML2Audio.load();
+
+  sfContextSettings specs;
+  specs.depthBits         = 32;
+  specs.stencilBits       = 32;
+  specs.antialiasingLevel = 1;
+  specs.majorVersion      = 3;
+  specs.minorVersion      = 3;
+
+  auto win = sfWindow_create(
+      sfVideoMode(600, 600), "sjplayer".toStringz, sfDefaultStyle, &specs);
+  scope(exit) sfWindow_destroy(win);
+
+  sfWindow_setActive(win, true);
+
+  auto running = true;
+  while (running) {
+    sfEvent e;
+    sfWindow_pollEvent(win, &e);
+
+    running = e.type != sfEvtClosed;
+
+    sfWindow_display(win);
+  }
+  return 0;
+}