RetroPie package updating improvements (Patreon)

Amongst other changes I have recently been improving package updating within RetroPie. A while ago I made it so binaries were only updated when there was a new version, but source installs would always rebuild everything when updating.With a PR I recently merged ( https://github.com/RetroPie/RetroPie-Setup/pull/3302 ), source based installs of packages now only update if there was a change upstream. This makes updating a lot quicker, as it avoids recompiling software that hadn't actually changed.Other changes include showing disabled packages in the menus as red so all packages are visible. When switching from the RPI3 to the RPI4 or to a Linux x86_64 system some users asked where certain emulators were etc. This should help with that I hope. Choosing the disabled package will show some information as to why it's disabled.I also added some headings to the package management and made it easier to install 3rd party repos via the ext/ folder ( see https://github.com/RetroPie/RetroPie-Setup/pull/3298 )I apologise for not using patreon more, and supporting my backers with updates. I have been busy improving RetroPie though, and I really appreciate your support.Thanks. Ps. Are updates like this useful? It's not much of a perk I guess, but I could try and give you all more feedback on progress if people were interested.