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Merge pull request #21 from Eaglegor/XmlSceneLoader

Xml scene loader
Stupid move semantics usage fix
Moved initSubsystems from engine start to a separate user/loader call
Merge pull request #22 from Eaglegor/CoreSubsystems

Moved initSubsystems from engine start to a separate user/loader call
Getter of properties returning boost::optional
Merge pull request #23 from Eaglegor/CoreSubsystems

Getter of properties returning boost::optional
Common parsers for Vector3 and Quaternion.
Formatting + fixed vector parser
Merge branch 'CoreSubsystems' of github.com:Eaglegor/UnknownEngine into PrepareToMergeFormatFiles

Conflicts:
	ComponentSystem/include/MessageSystem/MessagingPoliciesManager.h
	ComponentSystem/src/MessageSystem/MessagingPoliciesManager.cpp
Merge branch 'XmlSceneLoader' of github.com:Eaglegor/UnknownEngine into PrepareToMergeFormatFiles
Merge pull request #24 from Eaglegor/PrepareToMergeFormatFiles

Formatting and some fixes in parsers
Xml scene loader in application. Scene file may be specified at start.
Log level parser.
Merge branch 'master' of github.com:Eaglegor/UnknownEngine into CoreSubsystems
spaces
Boost lexical cast specialization to parse 'true' 'false' booleans
Merge branch 'XmlSceneLoader' of github.com:Eaglegor/UnknownEngine into AssimpMeshDataLoader
Assimp mesh data loader. Compilation fixes.
Scene loader supports data providers