Add more balance

Add ability to upgrade spawned creeps to Dire

Check path before allowing player to build barracks

This time I really got it. GetSoundDuration() always returns 2.0 on first call per sound per dota process. Solution is not to use it.

Fix: add null-check to prevent error of delayed call to stop sound when song already stopped and unit is already dead (hope that was the problem)

- Play music when ancient/boss hp is low and when you build an Anti-Army tower
- Grant XP to Dire heroes when ally creeps die nearby

Fix the bug that caused builder not be replaced if client loaded hero more than 10 seconds (if game was minimized for example)

Play a custom song at some point of game to liven things up

Remove herolist.txt for now since it causes here selection screen freeze since 7.0.7

Damn, last fix was incorrect - this time it should work

Yikes, accidentally uploaded it without the map file last time