New features

Application() profiles now support .py scripts as well
Application() and Profile() classes now correctly inserts that archinstall library path into sys.path from where it was installed. This has to be done in order to sub-executed scripts to get the correct version of archinstall when doing import archinstall in profiles and applications. Otherwise the installed/other libraries might take precedence over git clone'd repositories/submodules in projects (very noticeable in archinstall_gui for instance)
Added the add_AUR_support() function to enable AUR packages in the mountpoint (by compiling yay and installing it)
Added a yay() (and add_AUR_packages() pointer to yay()) command for installing AUR packages inside the mountpoint
Added enable_AUR() function to
Added run_command which will run commands inside the installation via arch-chroot {mountpoint}
Added arch_chroot which just points to run_command().
Added a set_timezone()
Fixed set_locale() in the Installer() class.
Also added a mirrors.py helper to rudimentary set mirror data on the installer host
awesome now has a .py profile instead of a .json, even tho the .json is still there.

Fixes

add_additional_packages() now gives a return value from pacstrap which it didn't before.
install_profile() now gives a return value from profile.install() which it previously didn't.
Profile() and Application() now skips looking for the profile/application if absolute paths are given (hopefully that logic works)
Added a __repr__ for Application() so it doesn't look like it's a Profile() being installed when printing the object.
Fixed desktop.py which was broken due to string formatting being a bit off.