In windowed mode, the mouse is no longer grabbed when one of the UI/console catcher is active. When a UI menu is active, the system's hardware cursor is shown, using the game's custom cursor texture, instead of simulating and rendering the cursor in-game.
* Add exports to load a raw image from the renderer
* Set the hardware cursor to the game's custom mouse cursor texture
* When mouse is not grabbed, the mouse gets updated with absolute mouse position, relative to the window position
This removes coupling between the renderer and UI/client functions. An option USE_RENDERER_DLOPEN was added to specify whether a renderer module should be compiled and loaded, instead of integrating the renderer into the executable directly. This opens the door for a new renderer
Profiling can be enabled with `cl_netprofile` and `sv_netprofile`, the overlay can be shown using `cl_netprofileoverlay` and `sv_netprofileoverlay` and the server can dump network profile using the `netprofiledump` command
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