Fixed a few bugs in Color (this fixes the eepp Tests blurred windows background).

Added `Primitives::drawSoftShadow` to draw simple shadows with primitives. Improved the shadow rendering adding correct rounded borders. UIWindow::drawShadow now uses this function.
Fixed a bug not displaying a recently create window when default transitions are enabled.
Plus some minor fixes.

.ecode/project_build.json

@@ -312,6 +312,12 @@
         "command": "${project_root}/bin/eepp-sound-debug",
         "name": "eepp-sound-debug",
         "working_dir": "${project_root}/bin"
+      },
+      {
+        "args": "",
+        "command": "${project_root}/bin/eepp-test-debug",
+        "name": "eepp-test-debug",
+        "working_dir": "${project_root}/bin"
       }
     ],
     "var": {