Fix MSAA crash by deferring change to between frames, fix M2 GO orientation

MSAA change was called mid-frame from settings UI, destroying the render pass
and framebuffers while the command buffer was still recording. Now deferred
via pendingMsaaSamples_ flag, applied in beginFrame() before any GPU state.

Also add +180° to M2 game object orientation to fix facing direction.

include/rendering/renderer.hpp

@@ -244,6 +244,9 @@ public:
     void setMsaaSamples(VkSampleCountFlagBits samples);
 
 private:
+    void applyMsaaChange();
+    VkSampleCountFlagBits pendingMsaaSamples_ = VK_SAMPLE_COUNT_1_BIT;
+    bool msaaChangePending_ = false;
     void renderShadowPass();
     glm::mat4 computeLightSpaceMatrix();