This fixes several issues with compatibility with C++20. C++23 was also
tested, but apparently it does not have any additional breaking changes
compared to C++20 (or we don't have those).
VCMI still uses C++17 as before - goal is only to make potential
transition easier.
There were 2 cases that are deprecated in C++20 that we use:
- Floating point operations on enums are deprecated
- `this` can no longer be captured when using default capture by value
`[=]`
Both of those should now be replaced with code that works fine in both C+
+17 and in C++20 mode
- 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
}
```
- Removed duplicated checks for DD possibility
- Moved most of spell-specific code from AdventureMapInterface to library
code
- AdventureSpellMechanics class now provides methods to check whether
spellcast is possible, similarly to battle spells
- If it is not possible to cast adventure map spell (e.g. no mana or no
move points) game will show infowindow immediately on clicking spellbook
instead of on cast attempt
- If hero does not have movement points for a DD, game will show correct
error message
- Added game settings 'dimensionDoorFailureSpendsPoints' due to
discovered H3 logic
