Add notes in Gcode files to Ground Control preview

[BarbourSmith]

Often times gcode files have notes about that sections of code mean in the gcode, usually in brackets like this:

(Path 1 1/4 inch bit)

I think it would be neat if this showed up as text on the gcode file when it was rendered in Ground Control

[mrfugu]

in the forums https://forums.maslowcnc.com/t/strange-error-mid-cut/3016/28 in the context of some odd G-code possibly messing up a cut, It would seem that a more advanced 'Pre-Flight Checklist' could incorporate Comments and (many) other stats and observations about files prior to attempting a cut.

Other possible alerts include "total estimated execution time", distance to travel, distance to cut, flagging Unsupported G-Code, excessive degrees of precision, Tool Changes, etc. Ideally, I would add Yes/No and Continue dialogue boxes and a facility to make some limited global, and simple line edits to files.

With the many possible sources of G-Code, the more that can be done to sanity check it in GC the better i'd think.