Move all configuration to configure.rkt

Stop using the install option of raco setup (a install option of pkg install would be better though).
`racket -l rwind/configure` must now be called to configure rwind instead of `racket -l rwind/install` or `racket -l rwind/install-session`.
add gnome-debug.start file
fix focus issue
Refactor: Use rect, size, and pos structs instead of values for windows, workspaces and heads
copy previous log in case of session crash
reformatting
error formatting
add debug messages
fix init-workspace crash
minor things