moved files out of subdirectories, added required documentation

src/echoing_resilience.cc

@@ -0,0 +1,33 @@
+#include "echoing_resilience.h"
+
+#include <algorithm>
+#include "constants.h"
+
+echoing_resilience::echoing_resilience(const position &pos):
+        potion{potion_type::ECHOING_RESIL, DURATION, pos} {}
+
+void echoing_resilience::apply(const enum race &race, int &HP, int &ATK,
+                               int &DEF, fraction &base_hit_rate) {
+        if (remaining_duration != 0) {
+                int tmp = GAIN_HEALTH * (race == DROW ? DROW_POTION_MUL : 1);
+
+                if (HP < MAX_HP[race])
+                        HP = std::min(HP + tmp, MAX_HP[race]);
+
+                ATK -= LOSE_ATK * (race == DROW ? DROW_POTION_MUL : 1);
+                DEF -= LOSE_DEF * (race == DROW ? DROW_POTION_MUL : 1);
+
+                ATK = ATK < 0 ? 0 : ATK;
+                DEF = DEF < 0 ? 0 : DEF;
+
+                --remaining_duration;
+        }
+}
+
+int echoing_resilience::get_priority() const {
+        return CALC_LAST;
+}
+
+const char *echoing_resilience::get_name() const {
+        return "ER";
+}