added colorizer and icon modules.
modified constraints file for video as given one is not suitable.
added the video controller modules to the top module nexys3fpga.v
Actual bot shape is given and made to change as per directions
colorizer module case statement is modified
nexy3_bot_if interface port_id and btns are assigned correctly.
Merge branch 'master' of https://github.com/rhodeser/freezing-nemesis

Conflicts:
	nexys3fpga.v