- Added `movementCostBase` parameter to game config that defines minimal
amount of movement points that will be spent when moving from one tile
on another while offroad (and cost of Fly / Town Portal spells)
- Added `BASE_TILE_MOVEMENT_COST` bonus type that allows modifying
`movementCostBase` on per-hero basis
Example usage for hota-like pathfinding skill
```json
"tileCostReduction" : {
"type" : "BASE_TILE_MOVEMENT_COST",
"val" : -15
}
```
Method CBonusSystemNode::getAllBonuses have 'root' parameter which is never
set to anythig else than nullptr. This patch removes the parameter and all
code that depends on it as preparatory work for further bonus system
optimization.
