added spin edit class and fixed some bugs

- computer/APIs/Component
* components can now be hidden by setting 'shown' to false
* don't get 'side' on touch events (window should check this)
* added some comments

- computer/APIs/DrawingPane
* fixed a nasty cursor-calculation-positioning-bug

- computer/APIs/Panel
* now passes interaction events to containing components

- computer/APIs/SpinEdit
* added

- computer/APIs/Window
* changed default fgColor to lime (looks better for me)
* constructor now has arguments for position and size
* title is now drawn on the title bar (even if the windows position is
not 1, 1 ;)
* now logs all events

- computer/bin/ctrt
* added functions to dig/place lines, planes and cubes (only prepared
this one ;)
* rebuild the GUI
* buttons are now larger
* added some comments

- computer/startup
* loading spin edit API

- turtle/APIs/trt
* fixed returning-bug on plane functions

- turtle/startup
* now waits for ACKs

- tCom
* command results now must be ACKed