* use const str as a param for defined_achievements_find
* GetStat()/SetStat(): return false if given name is not defined by stats.txt
* according to docs:
GetAchievement()/SetAchievement()/ClearAchievement()/GetAchievementAndUnlockTime()/IndicateAchievementProgress()
will always return true if the name was not null and exists in Admin page (achievements.json)
* ClearAchievement(): don't write user data unless json object doesn't exist, or key "earned" is true
* reduce the code in GetAchievementDisplayAttribute()
* according to docs IndicateAchievementProgress() returns false if the achievement is already unlocked
* many logging
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