Update license headers and add new licenses

- Renamed LICENSE.LGPL to LICENSE.LGPLv21
- Added LICENSE.LGPLv3 & LICENSE.GPLv2
- Removed LICENSE.GPL

Change-Id: I7ad600e0dbf455da7381f991ed09acafd63b89b2
Reviewed-by: Antti Kokko <antti.kokko@digia.com>
Reviewed-by: Tony Sarajärvi <tony.sarajarvi@digia.com>
Merge remote-tracking branch 'origin/5.4' into dev

Change-Id: Ibc5857ff434f757e1ec6f8fdc382898e51d8f570
Bump version

Change-Id: I4085d699f5475ecc2c8cb0090b2124480bb9f21d
Doc: Fixed broken links caused by "OS X" rename in qtdoc repo.

-article was renamed to use "OS X" from "Mac OS X".

Task-number: QTBUG-40759
Change-Id: I7eb9549883f6ba3be46120e4759e603752a3eb30
Reviewed-by: Jake Petroules <jake.petroules@petroules.com>
Reviewed-by: Topi Reiniö <topi.reinio@digia.com>
Doc: Changed instances of "Mac OS X" to "OS X".

-the official name is "OS X" and this change is only for
the documentation. Macros and API are untouched by this commit.

Change-Id: Ibdcfe2b8460685a6f8f895548288571dbb6e8a1d
Task-number: QTBUG-40759
Reviewed-by: Topi Reiniö <topi.reinio@digia.com>
Merge remote-tracking branch 'origin/5.3' into 5.4

Conflicts:
	.qmake.conf

Change-Id: Icabe869a513a8784db00fd388332d723f5379cc1
Merge remote-tracking branch 'origin/5.4' into dev

Change-Id: Ia5591669e96fca7f477a39c34573db086d07b221