SMD Component Magazines with Label Slots

Adding label slots to [robin7331's SMD Component Magazines](https://www.thingiverse.com/thing:3952021) design. This enhancement allows label paper strips (adhesive or not) to be attached on the magazine steadily, without the need to sand or treat the surface. Fully compatible with the rail in the original design.

Slot dimensions can be adjusted by changing the parameters in Fusion 360. The default parameters have been tested to fit with DYMO LabelManager 280's 12-pt font on 1/2" labels (trimming on the leading and trailing ends may be necessary).

Fusion 360 Project: https://a360.co/2OckSnY (compliant version only)