add pkgbuild to AUR & some other feedback

[tigercoding56]

make sure to set it as installable on all architectures (also it would be nice if class() blocks could have additional parameters or are im missing something ) as far as feedback goes other than that maybe add support to integrate a image editor (Libresprite or Gimp for example ) (also make blocks affect the python script (visibly ) if possible ) and it would be nice to be able to make costum blocks using scripts (and install pypi packages from GPblocks Desktop (native not electron ))