Drop support of too old PHP versions

The point I started this thread is that I believe that CI needs some big steps to move ahead.
The old structure of the framework needs some redesign.. Its build long time ago and today's PHP is very different, in the same direction must be going and CI as framework.
CI can't just continue to move in just the old direction it has. It needs to be up to date and for that some core methods must be pushed to a new level.

I want to notice 1 thing, Any one with old PHP Love/Project will be aways able to use CI 2.x and CI 3.x.
How ever if we want CI not to die we need to keep it close to the modern PHP as it is a PHP Framework !

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