princeView 7.10

- Performance improvement: check if enemy clone-able hero is inside
screen before drawing the clone marker circle
- Performance improvement: less variable allocations during OnTick()
- Clicking on the side HUD will now trigger a sprites refresh (atm I'm
trying to select the clicked enemy other than reloading sprites)
- Fixed round number function returning string instead of number, should
fix something, but don't know what exactly.
- Fixed death timer huge negative number when reloading script while
enemies are dead (it will show "0" instead)