Problem: Editors like gedit and others will not recognize *.xml.in files as xml, so if opened there is no syntax highlighting making those files harder to read.
This commit fixes this by adding <?xml version="1.0" encoding="UTF-8"?> to all *.xml.in files in lp:compiz 

Used extern in header files to declare variables there and initialize those and assign the values in the respective .c/.cpp files
Revert some "special" cases
Minor fixes

Some plugins had an oversight which caused them to not load correctly
due to a missing <deps> tag. Also some plugins should have been loading
after these plugins.

This fixes a potential glitch in newer versions of libdri.

It also fixes ugliness in the mass redirection/unredirection of windows
when the opengl plugin is loaded/reloaded

Loading them before opengl and composite doesn't do any harm, but
it causes an ugly flash while windows are reparented/unreparented
then redirected/unredirected when loading plugins if compiz
decides to insert them before the rendering plugins (since the
rendering plugins must first be unloaded then reloaded as they are popped
off the stack)

Use bcop.