This is a two-stage change, that first centralizes the file I/O code
path for on-disk and builtin:/ files. Secondly the resource embedding
pass now produces diagnostics if a file cannot be located.
The synthetic window we "inject" in the ensure_window() pass did not
have the window-background from the style applied. This is visible
for example when viewing something like
Rectangle { background: blue; border-radius: height / 2 }
When exporting an global multiple times under different names, make sure
that they alias in the generated code.
As a consequence, the compiler maintains the original unique name and in
Rust and C++ makes only the exported names public. In the interpreter
the internal name is theoretically still accessible from the outside.
And do some passes before inlining
We will need the list of components before inlining in order to generate
them if we disable inlining
So we can do some passes on each component before they are inlining
I tried to put the flickable pass in that list, but it did not work
if the Flickable itself is the root of a component
