Implement a memory safe way to connect signals. #152
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Fixes #150
I'll try to port Tijolo to this API, if everything works then I can merge this.
After merge this, there will only one more release before tag the .connect methods deprecated.
I need to write more tests... e.g. signals that return values doesn't work because the connect macro doesn't have return value information.
I also need to add more user friendly compiler error messages... anyway, it looks good for a POC.