[Ref/Feat] Clean up our routing and make it faster

[CommandMC]

Our Routes were a bit of an organically grown mess, with different approaches to do the same things, and generally using outdated React Router features. This PR cleans those up, and improves Heroic startup time in the process.

I did remove one route when "converting" from Route elements to objects: /last-url, I couldn't find any components navigating to it, so it seems like this was always unreachable? Other than that, I think we should look into making our WebView component less reliant on specific location.pathname values, instead just telling it what it's supposed to do (I've opted to choose params over props there, but I don't have any preference really, just seemed more convenient). Didn't want to touch too many things before a release though.

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Use the following Checklist if you have changed something on the Backend or Frontend:

• [X] Tested the feature and it's working on a current and clean install.
• [X] Tested the main App features and they are still working on a current and clean install. (Login, Install, Play, Uninstall, Move games, etc.)
• [ ] Created / Updated Tests (If necessary)
• [ ] Created / Updated documentation (If necessary)

[arielj]

I did remove one route when "converting" from Route elements to objects: /last-url, I couldn't find any components navigating to it, so it seems like this was always unreachable?

this is probably a leftover from when I implemented the feature to store the last url for the stores that then needed some tweaks

I think it's not used anymore. It's easy to check though, if the feature to ropen the stores in the last url works as expected it's all good