Qute alternative syntax {=foo}

[ia3andy]

The goal is to provide a configuration that enable a syntax for expressions that less susceptible to conflict with the content to avoid the need to escape everything:

It keeps {#...} for sections which is quite safe and introduce {=foo} (instead of {foo}).

We implemented a system allowing fine grained config allowing to specify which syntax a library is using:
quarkusio/quarkus#47882

[ia3andy]

We could also choose {>foo}, = means assign > means print.

We can change the PR for this if needed. I am not sure which is best.