The old parser always try first to find `Foo :=` from the old syntax so it
would error saying it expect an identifier or `:=`
But if we don't find a component, don't try to parse it as a component too early
This way we get better error and better auto-completions
Move "internal" crates into the `internal` directory. This first batch
includes most of sixtyfps_runtime but leaves the rendering backends
alone for now.
pre-commit applied some cleanups to the moved files:
- Consistent newline at end of file policy
- trimming trailing whitespace
- Formatting Cargo.toml files.
