Global constants support in compile expression and additional support in parameter/storage

type:added

As reported in #1394 (closed) , currently global constants for compile parameter and compile storage are not supported in the parameter/storage themselves (only present in the contract). This MR fixes that, and it also adds supports for --constants and --file-constants in compile expression. So, it closes #1394 (closed)

Changelog details: The sub-command compile expression now supports --constant and --file-constants for using global constants.