added fixed size to framebuffer io
added src/internal directory
renamed headers and sources
renamed in *.vcxproj
renamed tests
renamed tools
renamed tools vcxproj
added fj_file_io
addef FJ_ to include guard
added light color property
renamed SI_MEM_* to FJ_MEM_*
added default property vlaue
added default properties to shaders
added default values to ShowPropertyList
added PropSetAllDefaultValues to scene interface
removed hard-coded renderer id
fixed null primitive set segfault
added fj_multi_thread
added struct TextureCache
added lookup_cache