This commit moves the clipboard from WindowServer into a new Clipboard
service program. Clipboard runs as the unprivileged "clipboard" user
and with a much tighter pledge than WindowServer.
To keep things working as before, all GUI::Application users now make
a connection to Clipboard after making the connection to WindowServer.
It could be interesting to connect to Clipboard on demand, but right
now that would necessitate expanding every GUI app's pledge to include
"unix" and also unveiling the clipboard portal, which I prefer not to.
These are supposed to be interpreted caselessly so let's just use the
case insensitive traits throughout. This means we'll understand things
like "Content-Length" even when they send "content-length" etc.
Previously we were wasting the bottom pixel row on darkness. Use the
base button color all the way to the bottom row and offset the top
highlight by one pixel instead.
Perform a case insensitive search through the current menu. Jump to the
first item matching all keys in the current search. Backspace can clear
the current search, and the search will timeout after 3 seconds.
The menu manager will now send events directly to the current menu.
Previously if a menu was opened it would always be set as the current
menu. Now when opening a menu you can optionally say that you do not
want to have it as the current menu.
One scenerio when this happens is when a menu is popped up as part of a
preview, for example, when hovering over a menu item that is a submenu.
Sending the event to the current menu simplifies things and solves a few
inconsistencies in bevhaviour (such as hovering over a submenu, but key
events not being sent to the submenu).
When the user opens a context menu by right-clicking on something,
we now immediately stop sending mouse events to whoever was doing
active input window tracking before.
There are probably more situations where we should do this, and maybe
there's also a more generic way to express it, but this works for now.
Step one of moving DesktopServices::open handling out of process. This
makes it easier to do things like read in associations for which program
opens which files or protocols. This gives users the ability to modify
the associations without having to rebuild :^)
It didn't feel right to have a "DHCPClient" in a "Servers" directory.
Rename this to Services to better reflect the type of programs we'll
be putting in there.
