Update Metar.php

[FatihKoz]

The reported pressure was always being assigned as hPa thus resulting display and conversion errors when the reported pressure was inHg.

Also the VFR/IFR (VMC/IMC) determination was using minimum 5 nmi and 3000 ft cloud base, it must be 5 km and 3000 ft.

With this state, this PR should fix issue #948 and partly fixes issue #963

[FatihKoz]

Conversion and view just works fine as expected.

MetarTest must be checked for inHg and hPa logic. As any reported pressure with Annnn is inHg and Qnnnn is hPa. But as far as I see on the metarTest1 the units are wrong. Did not wanted to commit a change on the test.

[nabeelio]

The tests need to be fixed as part of this

[FatihKoz]

Do you approve the change of VFR to VMC and IFR to IMC , I can do that too ... It is kind of habit thing , technically they are VMC/IMC but on everyday use people tend to say VFR/IFR too often :)

Will send the MetarTest commit soon btw

[nabeelio]

I would leave it as VFR/IFR, which's normally used... that's also how I learned it in my PPL classes. IIRC, there is a difference between VMC and VFR. I'll have to look it up in more detail but I would leave that as-is. I will think about turning that into a translation maybe.