[bt-devel] New classes in the Sword backend and changed API

[Joachim Ansorg]

Hi!

While working on the Unicode thing, I had to change the API a little bit.

I had to add the class CSwordKey, which inherits from CKey.
CSwordVerseKey inherits now from CSwordKey and VerseKey, CSwordLDKey inherits 
from CSwordKey and SWKey.

CSwordKey contains now some often used functions, which are available for 
both CSwordVerseKey and CSwordLDKey (strippedText(), renderedText(), 
module(CSwordModuleInfo* newModule=0) etc.).

The "Thing* getThing()" and "setThing(Thing*)" functions are now replaced 
with "Thing* thing(Thing*)". It's now like it's done in Sword.

I hope everything does still work,
Joachim