Fix some missing initializers

Spotted by @fosnola

src/tools/vector2d.hpp

@@ -14,6 +14,7 @@
 #include <vector>
 #include <cstddef>
 
+// TODO: insert_row, insert_col
 template<typename Type, typename Alloc = std::allocator<Type>> class vector2d {
 	friend class row_ref;
 	friend class col_ref;

src/universe/creature.hpp

@@ -23,7 +23,7 @@ public:
 	eAttitude attitude;
 	location cur_loc;
 	short summon_time = 0;
-	bool party_summoned;
+	bool party_summoned = false;
 	short target = 6;
 	location targ_loc;
 	short health = 0;

src/universe/population.hpp

@@ -31,7 +31,7 @@ public:
 	void clear() {dudes.clear();}
 	cCreature& operator[](size_t n);
 	const cCreature& operator[](size_t n) const;
-	cPopulation() : which_town(200) {}
+	cPopulation() : which_town(200), hostile(false) {}
 	std::vector<cCreature>::iterator begin() {return dudes.begin();}
 	std::vector<cCreature>::iterator end() {return dudes.end();}
 	// Apparently Visual Studio needs this to work