DOCS: Replace copyright notes with trademark notes

As per issue #47, usage of copyright notes is wrong there.
ALL: Remove wrong-headed copyright note

See issue #47.
Instead, we list the trademarks in the AUTHORS now.
ALL: Update the copyright header

Replace "this software" with "xoreos" to make it more explicit
and link to the GPL on the web instead of suggesting to write
a letter to the FSF.
BUILD: Separate build fields in the version with a .

Per 10. of Semantic Versioning 2.0.0: build metadata.
DOCS: Update the copyright header in AUTHORS too
ENGINES: Prevent adding widget with used tag

Gui throws an exception if one adds a widget with a tag already in
use.
NWN: Fix automatic label positionning

The titles in chargen and charpremade was misplaced.
This fix tries to take into account the "Obj_Label_Width" field
according to the text vertical alignment.
GRAPHICS: Allow text to be sized

Add arguments, width and height, to Text::set() method.

Good to know, if the specified maximum height is smaller than text height, text is
truncated; last lines are removed to fit.
NWN: Allow text widget to be sized
GRAPHICS: Allow text alignment modification
NWN: Take into account label caption size
NWN: Allow getting text from TextWidget
NWN: Use directly text from label in GUI

The text from WidgetContext is not necesseraly the same as caption. As
an example, the text shown when you leave a game was empty. The commit
fixes this.
NWN: Fit text into button
AURORA: Add kFileTypeZIP and kFileTypeNDS

These are the base archives for NWN2 and Sonic.
AURORA: Add ZIP and NDS to the extension list, too
GRAPHICS: Remove display lists

Remove use and upkeep of display lists in graphics/aurora/model.
DOCS: Add mirv to the contributors list
DOCS: Move up ImperatorPrime and Supermanu to the team

Since they have full commit access now and are listed
in the Team group on GitHub, I figured that's warranted.
SOUND: Skip more useless WAV chunks

'cue '
'LIST'
'smpl'

Found in some NWN2 music files. Hopefully, the game
doesn't abuse them to mean something.