Fixed data paths

Fixed data paths
    src/Sprites-alpha.cpp
    src/Sprites-rotating.cpp
    src/Sprites.cpp
    src/Text-dynamic.cpp
    src/Text-static.cpp
Updated tests to use SDL2

Updated tests to use SDL2
Changed code style to suit personal preferences.

    src/Main.cpp
    src/Sprites-alpha.cpp
    src/Sprites-rotating.cpp
    src/Sprites.cpp
    src/Text-dynamic.cpp
    src/Text-static.cpp
Added SCons build files

Added SCons build files
    SConstruct     (+)
    src/SConscript (+)