Lower max strength cap in character creation

There's really no reason for the ability to start with more than
top-tier athlete strength. Mutants might have higher strength, but that
should be done with strength boosting mutations, not with stats taken in
character generation.

src/game_constants.h

@@ -118,7 +118,7 @@ constexpr time_duration CORPSE_ROT_TIME = 24_hours;
 #define MAX_SKILL 10
 
 // Maximum (effective) level for a stat.
-#define MAX_STAT 20
+#define MAX_STAT 14
 
 // Maximum range at which ranged attacks can be executed.
 #define RANGE_HARD_CAP 60

src/newcharacter.cpp

@@ -78,8 +78,8 @@
 #define COL_NOTE_MAJOR      c_green   // Important note
 #define COL_NOTE_MINOR      c_light_gray  // Just regular note
 
-#define HIGH_STAT 14 // The point after which stats cost double
-#define MAX_STAT 20 // The point after which stats can not be increased further
+#define HIGH_STAT 12 // The point after which stats cost double
+#define MAX_STAT 14 // The point after which stats can not be increased further
 
 #define NEWCHAR_TAB_MAX 6 // The ID of the rightmost tab