[DF-185] Added mutex.lock() before continue. Fixed freese
[DF-2911] Fixes in static occlusion
DF-185 Exit from Sprite::PrepareForNewSize() if sprite's file path is empty
[DF-3956] Now all textures are exported, including those, that aren't created still
Merge branch 'development' into water

Conflicts:
	Sources/Internal/Render/Highlevel/StaticOcclusion.cpp
	Sources/Internal/Render/Highlevel/StaticOcclusionRenderPass.cpp
	Sources/Internal/Render/Highlevel/StaticOcclusionRenderPass.h
	Tools/ResourceEditor/Classes/Qt/Scene/SceneHelper.cpp