The callback is only run when a change in HP is to be expected.
Following cases will not trigger the callback:
* Dead player damaged further
* Healing full-health player
* Change of 0 HP
Fixes some other third person camera specific attachments.
Implements a single new flag for entities to be forced visible in first person mode.
Old mods do not need to be updated to use the new flag and are fully backwards compatible.
This commit clarifies the maximal length of the serialized strings.
It will avoid accidental use of serializeString() when a larger string can be expected.
Removes unused Wide String serialization functions
