* clientobject, clouds, collision, clientsimpleobject: code modernization
* use range-based for loops
* simplify some tests
* various code style fixes
* use emplace_back instead of push_back when necessary
* use auto on some iterators
* use default operator when needed
* unroll v3s16 creation on collisionMoveSimple
* Environment code refactoring
* Cleanup includes & class declarations in client & server environment to improve build speed
* ServerEnvironment::m_gamedef is now a pointer to Server instead of IGameDef, permitting to cleanup many casts.
* Cleanup IGameDef
* Move ITextureSource* IGameDef::getTextureSource() to Client only.
* Also move ITextureSource *IGameDef::tsrc() helper
* drop getShaderSource, getSceneManager, getSoundManager & getCamera abstract call
* drop unused emerge() call
* cleanup server unused functions (mentionned before)
* Drop one unused parameter from ContentFeatures::updateTextures
* move checkLocalPrivilege to Client
* Remove some unnecessary casts
* create_formspec_menu: remove IWritableTextureSource pointer, as client already knows it
* Fix some comments
* Change required IGameDef to Server/Client pointers
* Previous change that game.cpp sometimes calls functions with Client + InventoryManager + IGameDef in same functions but it's the same objects
* Remove duplicate Client pointer in GUIFormSpecMenu::GUIFormSpecMenu
* drop ClientMap::sectorWasDrawn which is unused
Finish fixing the material color code. But it won't work until MineTest has dynamic lighting... another day another feature.
Extra checks for the bone positioning / rotation code
Many checks and consistency improvements to the client attachment code
Make a separate function for checking if a client object is attached. A more in-depth change will be needed here to fix reading of invalid pointers
Use a different method of fetching the parent. Fixes the mass segmentation faults when rendering an attachment (some still happen though)
Major change to how attachments are handled. Fix the last segmentaton fault, which was due to the parent becoming invalid while being refreshed / removed which would bause the child to remain attached to nothing. Parents remove their children when being deleted themselves and add them back when re-added. Attachments are stored inside a 2D a vector which easily allows both a child to find their parent and a parent to find its children.
Remove attachment list entry when an object is being permanently removed. Also avoid duplicate entries in this list when re-attaching the same object
The "big code comments" can now go away. Client attachments almost work properly, and I know what else needs to be done
