Remove WindowManager wrappers.
It's not safe to use WindowManager in all places and it's not required.
Environment stores resource system providing VFS required to call these
functions. In the case of ObjectPaging it's available from the member variable.
Also ObjectPaging::createChunk may access WindowManager when it's already
destructed when exiting the game because it's destructed before CellPreloader
finishes all background jobs. Engine::mResourceSystem is destructed after all
other systems so it's safe to use it.
for MWWorld::Action, ProjectileManager and ESSImport::Converter.
shared_ptr has additional cost of reference counter and requires additional
allocation when constructed as shared_ptr<T>(new T).
Currently, we use a peculiar mapping of ESM classes by their std::type_info::name. This mapping is an undefined behaviour because std::type_info::name is strictly implementation defined. It could return a non-unique value on some platforms. With this PR we use the unsigned int sRecordId of the ESM class as a more efficient lookup type that does not build on undefined behaviour. We can expect marginally faster save-game loading with these changes as well.
OpenMW save file assumes the presence of NPC/Creature data but the vanilla save file provides only the delta changes in most situations. The base data are not available without loading all the relevant dependency content files. Duplicating that code in the ESSImporter is not desirable.
Ideally a flag should be set but that will mean a change in the save file format. For a minor change such as this doing so seems like an overkill. So a temporary workaround is introduced where the gold carried by the NPC/Creature is used as an indicator as the lack of ACDT data.
Refactoring related to "smooth movement"
See merge request OpenMW/openmw!285
(cherry picked from commit 6eaf0a389d5aed3b74ab1a7cf89574612f964bdf)
e847b4c8 Split getSpeed() to getMaxSpeed() and getCurrentSpeed()
a96c46bc Refactor calculation of movement.mSpeedFactor
03ee9090 Use getMaxSpeed instead of getCurrentSpeed where it makes sense.
a178af5c Create helper functions `normalizeAngle` and `rotateVec2f`
