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Added TWarnings.Defaults class method that creates a TWarnings object containing a list of default warnings.

Removed TWarning constructor that took only a symbol name as parameter and modified code that called it (in only a single place in same unit) to use full form of constructor, passing dummy min. compiler and state values.

* Modified to permit a warning to be switched on as well as off, with state being set by new TWarning.State parameter.
* Made changes to TWarningsPersist and TWarnings.Render to support new warning state.
* Changed IWarnings.Delete method, and implementation, to take a TWarning parameter instead of symbol name string parameter.

Renamed TWarnings.SwitchOff property as Enabled.
Modified all using code.
Also changed name of check box that updates this property in TCodeGenPrefsFrame to suit.

NOTE: Name of item relating to TWarnings.Enabled in User.config remains "SwitchOffWarnings" for backward compatibility reasons.

Reintegrated v4-dev branch into trunk.
Trunk now contains v4 development tree

Simplified enumerator code. Replaced custom enumerator with calls to the TList<T> enumerator. Removed redundant code.

* Renamed internal list that maintains list of warnings in TWarnings.
* Changed TWarnings.Assign to enumerate warnings in source object using enumerator rather that Items[] property.

Commented units.

Added new UWarnings unit that encapsulate Delphi $WARN directives used to switch off unwanted compiler warnings.