* Upgrade GCC project files for e2 studio v7.8.0 in Demo/RX100-RSK_GCC_e2studio folder
* Update Demo project file to e2 Studio v8 and remove the .bat file.
* Update the choice of toolchain version.
* Update the link in file header.
Co-authored-by: NoMaY (a user of Japan.RenesasRulz.com) <NoMaY-jp@outlook.com>