Support for configuring screen backlight

Accelerant interface:
Introduce new hooks B_SET_BRIGHTNESS and B_GET_BRIGHTNESS. Brightness is
a float in the 0..1 range.

App_server:
Forward brightness things between BScreen and the accelerant.

intel_extreme:
Implement the hooks. Note that this only works for laptop panels, but
the driver will pretend to support it in other cases as well.

Screen preferences:
If the accelerant supports the B_GET_BRIGHTNESS hook, allow to set
brightness with a slider. Otherwise, the slidere is hidden and these
changes aren't visible.

Applied an updated patch by looncraz to enable hardware cursor.

I made the following changes to the original patch:
* Add const to the cursor setting functions.
* Removed the legacy cursor copying code.
* Minor coding style cleanup.

Rewrote headers.

+alphabranch


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@32747 a95241bf-73f2-0310-859d-f6bbb57e9c96

* Introduced a monitor_info structure and means to let it be filled by the
accelerant (or the app_server via EDID info). It's still experimental
API, and opinions are welcome.
* Moved BPrivateScreen into the BPrivate namespace.
* Rewrote Screen.h.
* Introduced a BScreen::GetMonitorInfo() method, and implemented it in the
app server as well (ie. AS_GET_MONITOR_INFO).


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@22563 a95241bf-73f2-0310-859d-f6bbb57e9c96

* Started accelerant extension to be able to get the preferred mode from
the accelerant, as well as its EDID info. B_GET_PREFERRED_DISPLAY_MODE and
B_GET_EDID_INFO are both optional. The preferred mode will be taken from the
EDID info if only the latter hook is implemented, or the former returned an
error.
* Currently, the app_server should correctly set the preferred mode on start,
but no accelerant supports that yet, so it's not really tested.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@22520 a95241bf-73f2-0310-859d-f6bbb57e9c96

some header files to be R5 compatible


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@1617 a95241bf-73f2-0310-859d-f6bbb57e9c96

Applied an updated patch by looncraz to enable hardware cursor.

I made the following changes to the original patch:
* Add const to the cursor setting functions.
* Removed the legacy cursor copying code.
* Minor coding style cleanup.

Rewrote headers.

+alphabranch


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@32747 a95241bf-73f2-0310-859d-f6bbb57e9c96

* Introduced a monitor_info structure and means to let it be filled by the
accelerant (or the app_server via EDID info). It's still experimental
API, and opinions are welcome.
* Moved BPrivateScreen into the BPrivate namespace.
* Rewrote Screen.h.
* Introduced a BScreen::GetMonitorInfo() method, and implemented it in the
app server as well (ie. AS_GET_MONITOR_INFO).


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@22563 a95241bf-73f2-0310-859d-f6bbb57e9c96

* Started accelerant extension to be able to get the preferred mode from
the accelerant, as well as its EDID info. B_GET_PREFERRED_DISPLAY_MODE and
B_GET_EDID_INFO are both optional. The preferred mode will be taken from the
EDID info if only the latter hook is implemented, or the former returned an
error.
* Currently, the app_server should correctly set the preferred mode on start,
but no accelerant supports that yet, so it's not really tested.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@22520 a95241bf-73f2-0310-859d-f6bbb57e9c96

some header files to be R5 compatible


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@1617 a95241bf-73f2-0310-859d-f6bbb57e9c96