conver element_from_point -> handle_from_point to get hwnd
remove RA_CurrentNativeWindowHandle
remove RA_GetCurrentControlType
remove RA_Select
get rid of RA_FindChildren / Window#count_children
get rid of RA_ClickMouse / RA_MoveMouse
Revert "get rid of RA_ClickMouse / RA_MoveMouse"

This reverts commit 8cebe8fed1ecd7b57abfa2d9d6eeb2d57e90bf2b.
update IsOffscreen method so we can get rid of ElementFromHandle
:punch: to the jejunum for global automation COM pointers
get rid of RA_ prefixes