1) Removal of archlinux_grub_mkconfig_fixes.patch, replaced with 10_archlinux helper script, and grub-add-GRUB_COLOR_variables.patch (small non-Arch specific part of the earlier patch). Fixes https://bugs.archlinux.org/task/37904 .
2) Bump directly used unifont bdf file to working ver 6.3.20131217 as mentioned at http://savannah.gnu.org/bugs/?40330
3) grub-extras is now available as GIT repo, so removed bzr from makedepends. As a consequence removed python2 and used python(3) in makedepends. Incorrect GRUB_CONTRIB var also fixed.
4) grub-extras LUA and ntldr-img are set to be deprecated, so they are not built. The only grub-extras version built is 915resolution (for grub-bios aka target i386-pc alone)
5) PKGBUILD directly used GIT TAG support by makepkg to checkout the souce instead of downloading the upstream tarball
6) https://bugs.archlinux.org/task/38054 already fixed in 2.02-beta1.
7) https://bugs.archlinux.org/task/38053 also fixed in 2.02-beta1. I personally never experienced this issue so cannot comment on this
8) Added suffix grub-efi build dir so that it is easy for users to modify the PKGBUILD to build i386-efi in Arch x86_64 if required (not officially supported).