INT 62 u - FDGRIVER v3.03 - "FG_INSIDE" - CHECK IF POINT INSIDE CONVEX POLYGON
        AX = 004Fh
        ES:BX -> vertex array
        CX = number of vertices
        DX = screen space column of point to test
        SI = screen space row of point to test
Return: AX = result
            0000h point is outside polygon
            0001h point is inside polygon
            undefined if not a convex polygon
Note:   For FGDRIVER v1.10, this function was "FG_DISPFILE" (see AX=0018h);
          "FG_INSIDE" did not exist yet
SeeAlso: AX=0078h,AX=0079h,AX=007Ah

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