NetSurf 3.0 Development

Changes:

     * selectable, copyable text
     * scrollbar works in frames
     * added caret
     * updated: - libpng 1.5.13
                      - libsdl_image 1.2.12
                      - libturbojpeg 1.2.1
                      - libcurl 7.28
     * updated getvideo 0.32
     * works on Aros m68k now
     * fixed closing of program
     * 16 bit works again