This is the main aggregator for all gwt submodules.
All gwt-specific code resides here.
Submodules should avoid inheriting from each other unless necessary.
This goes for maven structure and gwt.xml structure.
The super module is where our jre emulation layer and super-source live;
all modules should inherit super, and a minimum of other modules.
Some modules, like injection, are fulfilling an api in the core module,
and should be accessed only through core service interfaces.
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