dev-util/codeblocks: 20.03 version bump

dev-util/codeblocks: 20.03 version bump

- Update CodeBLocks to 20.03 with new patch to build Fortranroject plugin;
- Now xdg eclass is used instead of xdg-utils eclass;
- FortranProject plugin update from [r270] to [r277] with some additional
  features before FortranProject v1.7 release. Patch from [r273] fixes
  the build issue for compiling with USE=pch.

Closes: https://github.com/gentoo/gentoo/pull/15182
Signed-off-by: Sergey Torokhov <torokhov-s-a@yandex.ru>
Signed-off-by: Mart Raudsepp <leio@gentoo.org>