Move primitive wrappers into its own package "imgui.type"

imgui-lwjgl3/src/main/java/imgui/gl3/ImGuiImplGl3.java

@@ -4,7 +4,7 @@ import imgui.ImDrawData;
 import imgui.ImFontAtlas;
 import imgui.ImGui;
 import imgui.ImGuiIO;
-import imgui.ImInt;
+import imgui.type.ImInt;
 import imgui.ImVec2;
 import imgui.ImVec4;
 import imgui.flag.ImGuiBackendFlags;