Delay Variable for Pre-Gate Sensor Preload Function

[SkiBikePrint]

For pre-gate sensors that are remote from the MMU, such as at the buffer, it would be useful to have a user set delay variable for the automatic preload function. This gives the user time to push filament to the mmu as part of loading a new spool. Default could be zero which would maintain the current functionality of an immediate attempt to preload.

[moggieuk]

Rather than delay, there is a new feature in v2.7.0 preload_attempts (default 5). This can be increased and consequently the time will increase.

[SkiBikePrint]

Even better! Thanks!