DINPUT: Generic FF effect implementation (FF #4)

[Daniel Remenak]

The fourth in a series of patches to enable force feedback through
DirectInput on linux event devices.

Changelog:
Add a generic force feedback effect implementation

This patch includes a bunch of support code for all DirectInput FF
effects, and adds stubs for a generic FF effect interface.

Details:
1. Stubs for a generic implementation of the IDirectInputEvent interface
2. Debug utility functions to dump common structures
3. Implementations of necessary object functions (e.g. AddRef,
Release, QueryInterface)
4. Complete implementations of system-independent SetParameters and
GetParameters

This patch adds two files, effect.c and effect_private.h, in the
dlls/dinput directory.  This patch depends on FF #3 in order to
compile.

--Daniel Remenak
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