Added Tooltip support to IControls

from e2ca5d08b86bffd3a1312389cd94516846c3da27
IGraphicsCocoa: Implemented tooltip support

from a4e5941a729bee56197fd29b7da82c3cb3ce2115
[IPLUG] formatting
[IPLUG] corrected some incorrect comments
[IPLUG/EXAMPLES] convoengine WDL_FFT_REALSIZE=8
[IPLUG] detabbed duplicate.py
IGraphicsCarbon: Implemented tooltip support.

from tale
IGraphicsCarbon comment
from Tale IGraphicsMac: Nitpicked Carbon friend class.
IGraphicsCarbon: Display tooltips at mouse coords. (From Tale)

Display tooltips below the mouse cursor rather than below the control's
target rectangle.

Conflicts:
	WDL/IPlug/IGraphicsCarbon.cpp
	WDL/IPlug/IGraphicsMac.h
	WDL/IPlug/IGraphicsMac.mm
IGraphicsCarbon: Fixed tooltip positioning.

Mimic Cocoa behaviour, i.e. don't consider actual mouse cursor height,
just use a fixed offset.

Conflicts:
	WDL/IPlug/IGraphicsMac.mm
IGraphicsCocoa: Fixed tooltips not being removed.

AU Lab would crash if you switched from Cocoa to Carbon and then back to
Cocoa, because the tooltips of the 1st Cocoa would still be there (so
view:stringForToolTip:point:userData: would be called with mGraphics ==
NULL).
IGraphicsCarbon: Fixed tooltip string memory leak (thanks Oli!).

Apparently in Mac OS X 10.4 and later HMDisplayTag() makes a copy of the
content and releases the copy when the tag closes, so you can (should)
release the content after HMDisplayTag() returns, see:

http://webnnel.googlecode.com/svn/trunk/lib/Carbon.framework/Versions/A/Frameworks/HIToolbox.framework/Versions/A/Headers/MacHelp.h

Conflicts:
	WDL/IPlug/IGraphicsCarbon.cpp
IGraphicsWin: Implemented tooltip support. based on Tale's: 40cd415
Merge branch 'refs/heads/tooltip' into next
[IPLUG] added IGraphics::ShowControlBounds()

set it to true to reveal exactly where the bounding boxes for IControls are. Bounding boxes are only shown in DEBUG builds
[IPLUG] IGraphicsMac: change the way we GetDesktopPath()
[IPLUG] added IGraphics::AppSupportPath()

returns

//Windows7: %LOCALAPPDATA%\
//Windows XP/Vista: %USERPROFILE%\Local Settings\Application Data\
//OSX: ~/Library/Application Support/