Add lottery system
增加抽奖系统

Basic fixes for 7.23, including:
1. Level setting adjust to 30 50 100 etc.
2. Leveling up after lv. 30 is 4 times harder now (as leveling up from lv. 25 to lv. 30 is 4 times harder than before lv. 25)
3. Give courier from start, though it won't level up :(
4. papyrus scarab: All stats 20->30, health regen area 40->15, base damage area 25%->30%, lifesteal 25%->30%, armor aura 20->10, attack speed aura 60->40
5. Ragnarok: grants 12 hp regen now.
6. True Ragnarok: status resistance 25->30, damage 50 -> 60, hp regen 6->20, grant 25% more health regen amp and lifesteal amp now.
7. Terra Blade: status resistance 50->60, damage 150->160, hp regen 20->35, grant 50% more health regen amp and lifesteal amp now.
8.Angelic Alliance: Grant True Strike
9. Fix for additional back pack slot
Also, Item Master get a talent enable him to benifit from backpack items with Refined Weapons.

Nerf Terra Blade: range from 200->125, distance from 4000 to 1200.
Tower regen is now a constant instead of percentage of maximum health.

Fix bot not using fun items

Max Level to 1600 to avoid error

Change max level to 1600.

Angelic Alliance give 20 strength/agility instead of 150 now
Ragnarok/True Ragnarok/Terrablade can now be disable regen with damage from enemy heroes

Add Medusa the Old Gorgon
加入旧版蛇发女妖

Fix bots can buyback without cooldown
New hero: Old Storm Spirit.

add three new options:buy back time, anti diving and bot protection