Default keymap- move context menus to CLICK instead of PRESS

To the user, the behavior is identical. They won't notice a difference at all.

To someone who wants to actually bind something else to right click it makes a HUGE difference. currently, the context menu eats the mouse event and doesn't let anything bound to right click happen. This includes RMB+Drag, RMB+Tweak, etc.

Edit for clarification: if, for example- you want lasso select on right mouse tweak, you can actually do it without sacrificing the right click context menu. Blender is smart enough to know the difference between a click/tweak/press/etc, so long as the key bindings are set up correctly- which, in my opinion the default keymap is not in this example. If the context menu were on CLICK, you could bind lasso select to RMB+Tweak [Any] and you would have both lasso select and the context menu on the right mouse button and they would not conflict with each other.