Added first UI elements

Rules can be created from the UI
Game can be stopped/started from the UI
Current level can be reset (Load from file again)
Added "Game" target and main file

TODO (A lot):
 - Unit tests
 - Fully functionnal UI
 - Win conditions
 - Level background
 - Level switching/progression
 - Interesting and varied rules
 - Multi-scale pathfinding
 - etc

src/Entity.cpp

@@ -6,10 +6,14 @@
 
 const std::map<std::string,EntityType> Entity::entityTypeLookup = {
         {"Citizen",EntityType::Citizen},
-        {"Significant",EntityType::Significant},
+        {"Noble",EntityType::Noble},
         {"House",EntityType::House},
         {"Car",EntityType::Car}};
 
+const std::map<std::string,State> Entity::stateLookup = {
+        {"Seek",State::Moving},
+        {"Flee",State::Fleeing}};
+
 Entity::Entity(pro_maat::GridUnit x, pro_maat::GridUnit y, EntityType type, sf::Texture* texture, int width, int height) : type(type)
 {
     shape = sf::RectangleShape(sf::Vector2f(width*pro_maat::pixelsPerUnit,height*pro_maat::pixelsPerUnit));