v0.2.21 Editing, homing and LightBurn fixes

Changes in Beam Bench 0.2.21.

Numeric fields can be cleared before entering a replacement value. Leaving a field blank restores the last valid value.
Home works from the startup Alarm state on homing-capable GRBL controllers. Delayed Idle replies no longer indicate completion too early.
LightBurn .lbrn2 imports preserve smooth-curve control handles, correcting distorted outlines and fills.

See Software update for installation instructions.

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