minor changes and added namespace to avoid conflicts when integrating with PanoPainter

engine/shader.cpp

@@ -1,6 +1,8 @@
 #include "pch.h"
 #include "shader.h"
 
+using namespace ui;
+
 std::map<kShader, Shader> ShaderManager::m_shaders;
 Shader* ShaderManager::m_current;