Pin 1 silk: Update RF_GPS

Update the RF_GPS library as part of #2637.

Mostly just added silk screen arrows in place of "long line" markings. A few variations are used depending on the module shape and existing silkscreen styles. E.g.:

Other changes:

• A couple of silkscreen corner brackets extended to the 0.2mm point and unified to 0.11mm fab-silk centreline offsets.
• Some ref des and value positions and sizes/thicknesses normalised
• 3D model paths updated

Remaining KLC notices all pre-exisiting:

• EC02: not all parts have rounded pads
• F9.2: SAM_M8Q has a solder mask margin of 1e-6, not 0