WIN_HELP_INDEX and HELP_INDEX are unused

Change-Id: Icc2c34f51601304e2846d8bd9fce2f384327a4e2
WIN_HELP_HELPONHELP and HELP_HELPONHELP are unused

Change-Id: I54830ba65961f8f7ab6fa3555a1e6021b14cdb1c
WIN_MOUSE_MOVED and MOUSE_MOVED are unused

Change-Id: I1edfa97d9874c70fcc61d1b521c905fb499a9bd1
fdo#82580: Win32 GetObject() simplification

We call the Win32 GetObject() in just one source file and there it is
the A version we mean. (As such, as we call it to get BITMAP objects,
which do not have different A and W variants, we could as well call
GetObjectW().)

Note that we have several own member functions called GetObject(), so
until those are renamed we still need to #undef the GetObject
definition (from <windows.h>).

(No, I am not working on the EasyHack fdo#82580 as a whole. It is
intended for some less mature LO contributor. I just did a few small
things because I couldn't resist.)

Change-Id: Idab79503b3d899ef19f0608677752a62b20302ff