unify dojo.cache and requirejs inlined text resources

[Adam Peller]

Chuck writes:

I've been experimenting with optimized builds produced by requireJS's optimization tools and have discovered that its technique for inlining text resources is not compatible with the dojo.cache integration implemented by the text plugin located in the dojo/lib/plugins directory. This is because when a text resource is inlined into an optimized build, the text plugin is never called to load the resource (it doesn't need to be loaded) so the plugin never gets a chance to add the resource to the dojo cache.

I've come up with a solution that works for inlined and non-inlined text resources, and does not require a custom plugin. It modifies the dojo.cache implementation to use the synchronous mode of the require call to check to see if the resource has already been loaded by the async loader before attempting to load the resource itself

The references to require, the build pragma, and the synchronous reference may need further discussion.

[Adam Peller]

patch from Chuck Dumont (IBM, CCLA)

[dante]

hmm this one has the patch, but it's a duplicate of #12383