moved files out of subdirectories, added required documentation

src/borrow_life.cc

@@ -0,0 +1,29 @@
+#include "borrow_life.h"
+
+#include <algorithm>
+#include "constants.h"
+
+borrow_life::borrow_life(const position &pos):
+        potion{potion_type::BORROW_LIFE, DURATION, pos} {}
+
+void borrow_life::apply(const enum race &race, int &HP, int &ATK,
+                        int &DEF, fraction &base_hit_rate) {
+        if (remaining_duration == DURATION)
+                HP += GIVE_HP * (race == DROW ? DROW_POTION_MUL : 1);
+
+        if (remaining_duration != 0)
+                --remaining_duration;
+
+        if (remaining_duration == 0) {
+                HP -= LOSE_HP * (race == DROW ? DROW_POTION_MUL : 1);
+                HP = HP < 0 ? 0 : HP;
+        }
+}
+
+int borrow_life::get_priority() const {
+        return CALC_LAST;
+}
+
+const char *borrow_life::get_name() const {
+        return "BL";
+}