Revert "Manage current request in RestxRequest.java with thread local set in StdRestxMainRouter.java when a route is found."

This reverts commit 1362980016143e7b0ef4a562fcd2066e16fba2f5.

Conflicts:

	restx-core/src/main/java/restx/RestxRequest.java
Add a way to get Locale on RestxRequest. This locale get be "injected" in *Resource with Param annotation.
For instance :
@GET("/locale")
@PermitAll
 public Locale getLocale(@Param(kind = Param.Kind.CONTEXT, value = "locale") final Locale locale) {
    return locale;
 }
Test locale from @Param