cleanup build. add demo project. add timing features to sync. switch to more std::string and std::vector usage over custom, hacky Array template

inc/body.hpp

@@ -2,6 +2,7 @@
 
 #include <glm/ext/matrix_float4x4.hpp>
 #include <glm/glm.hpp>
+#include <string>
 #include "util.hpp"
 
 struct Body {
@@ -11,11 +12,11 @@ struct Body {
     uint vao;
     uint vbo;
     uint shader;
-    Array<float> verts;
-    Array<int> faces;
+    std::vector<float> verts;
+    std::vector<int> faces;
     glm::vec4 color;
 };
 
-bool load_body(Body* out_body, const char* obj_filepath);
+bool load_body(Body* out_body, std::string filepath);
 void draw_body(const Body& b);
 void create_new_sphere(Body* b, float scale=1.0f);