Address UB warnings found by the static analyzer

src/game/boe.actions.cpp

@@ -2744,7 +2744,7 @@ location get_cur_direction(location the_point) {
 
 static eDirection find_waterfall(short x, short y, short mode){
 	// If more than one waterfall adjacent, randomly selects
-	bool to_dir[8];
+	std::bitset<8> to_dir;
 	for(eDirection i = DIR_N; i < DIR_HERE; i++){
 		if(mode == 0){
 			eTerSpec spec = univ.scenario.ter_types[univ.town->terrain(x + dir_x_dif[i],y + dir_y_dif[i])].special;
@@ -2757,7 +2757,7 @@ static eDirection find_waterfall(short x, short y, short mode){
 		}
 	}
 	short count = 0;
-	for(int i = 0; i < 8; i++)
+	for(int i = DIR_N; i < DIR_HERE; i++)
 		count += to_dir[i];
 	if(count > 0) count = get_ran(1,1,count);
 	else return DIR_HERE;

src/game/boe.combat.cpp

@@ -1023,7 +1023,7 @@ void do_combat_cast(location target) {
 		CLOUD_STINK,CLOUD_STINK,
 		WALL_ICE,WALL_ICE,WALL_BLADES,
 	};
-	mon_num_t summon;
+	mon_num_t summon = 0;
 	iLiving* victim;
 	cPlayer& caster = univ.current_pc();
 	bool allow_obstructed = false, allow_antimagic = false;

src/game/boe.specials.cpp

@@ -3554,7 +3554,7 @@ void ifthen_spec(const runtime_state& ctx) {
 				ctx.next_spec = spec.ex1b;
 			else if(dynamic_cast<cPlayer*>(&current_pc_picked_in_spec_enc(ctx))) {
 				int pc = univ.get_target_i(current_pc_picked_in_spec_enc(ctx));
-				eMainStatus stat;
+				eMainStatus stat = eMainStatus::ALIVE;
 				switch(spec.ex1a) {
 					case 0:
 						stat = eMainStatus::DEAD;
@@ -4570,7 +4570,7 @@ void handle_message(const runtime_state& ctx, const std::string& title, pic_num_
 }
 
 void get_strs(std::string& str1,std::string& str2,eSpecCtxType cur_type,short which_str1,short which_str2) {
-	size_t num_strs;
+	size_t num_strs = 0;
 	if(cur_type == eSpecCtxType::SCEN)
 		num_strs = univ.scenario.spec_strs.size();
 	else if(cur_type == eSpecCtxType::OUTDOOR)

src/game/boe.text.cpp

@@ -915,7 +915,7 @@ void print_nums(short a,short b,short c) {
 }
 
 short print_terrain(location space) {
-	ter_num_t which_terrain;
+	ter_num_t which_terrain = 0;
 	
 	if(overall_mode == MODE_LOOK_OUTDOORS) {
 		which_terrain = univ.out[space.x][space.y];