Improve robot model after receiving feedback from constructors.

[Dangield]

Wait with this task after robot construction is completed. Improvements will be noted in comments.

[Dangield]

• Change battery holder holes to 3mm and implant their nuts during print.
• Install an arm using a standard bearing on the opposite side to the servomotor.
• Change bolt holes in scoop to be compatible with cone-head bolts.
• Change bolt holes in roof to be compatible with cone-head bolts.
• Change bolt holes in bracing to be compatible with cone-head bolts and remove the back column from it.
• Change the right back column holding a robot roof to accept 3M bolt instead of 2.5M bolt and not collide with the scoop's arm.
• Change holes in the front of the main chassis that hold the bracing to fit 3M nuts.

[andrzej-matwijenko]

Fix size of nut's chanel in front side of main bracing for the bumper

Make a little more space for servo cables in the servo holder

Make longer main bracing and bumper for the battery pack

Make a bigger mounting socket in left arm for a servo motor holding disk

Make a little arch or hole in the bumper for the battery cable's

[Dangield]

Recreate/reclaim from old commits the model for the wheel's rim.

[gosidul]

The wheel's rim is now available in all formats, including stl, in the current commit.