Geode v5 planning

Planned changes for the next major Geode update. Most of these are ABI or API breaking, which is why we have to delay them

Changes marked with "⚠️" are more likely to affect more devs, or in bigger ways.

Changes

• ⚠️ Switch to using romver?
  • This will likely only be done for Geode itself, and not for mods
• ⚠️ Rethink dependency importance, maybe only have required and optional.
  • Naming of the current system is confusing, perhaps recommendations should just be separate
• ⚠️ Remove some of the obsolete CC_ macros (most importantly array/dict iteration) and make their usage tell the user about the Geode alternative (mostly done, requires breaking bindings change to finish)
• Switch to std::move_only_function (c++23 only and unavailable, c++20 implementation)
• Use string_view and span in most cases of std::string const& and std::vector<T> const& (strings mostly done!)
• Add noexcept everywhere?
• ⚠️ Make Layout::ignoreInvisibleChildren default to true
• remove geode::cast::as
• remove cacao's vectorToCCArray (move it to ccarrayext or something)
• Make MDTextArea pimpl or just final
• Loads of v5 changes in mod metadata validation
  • Remove validateOldID (Pull Request)
  • [Old "gd" key syntax](https://github.com/geode-sdk/geode/blob/504865dd24f1add4fb87f6f138f8fd0bbbc067ae/loader/src/loader/ModMetadataImpl.cpp#L129 (Pull Request)
  • ⚠️ Remove array dependencies syntax (Pull Request)
• Remove CCDestructor
• Mod::getMetadataRef -> Mod::getMetadata (Pull Request)
• Store compat mode in MDTextArea as a member
• Use the NoHashHasher trick for other things in GeodeNodeMetadata, i.e. user objects
• Change ColorPickPopup to use callbacks instead of delegates (Pull Request)
• Make Popup intercept keyBackClicked instead of checking for esc in keyDown
• Fix FileWatcher (right now it's pretty bad and causes weird crashes and memory leaks, also windows only)
• Expand EventV2 and make it the primary event system
• Rewrite Task