Covnvert all GRPlugin stands to polygons

[Adrian2k]

Sceneries does have too much variety in them, making stands not show as occupied. Would be better to convert all to all to polygons instead.

Example from ENBR

[Adrian2k]

@Atriusftw I have previously done this by creating polygons in QGIS and converting the coordinates with https://webtools.kusternet.ch/geo/coordinatesconverter

[Atriusftw]

• [x] ENBR
• [x] ENVA
• [x] ENZV
• [x] ENTO