Introduce namspaces for class names

[Maximilian Rest]

wdfTree becomes wdf::Tree
wdfTreeNode becomes wdf::TreeNode

Also, extend truncated names to

wdfTerminatedCap becomes wdf::Terminated::Capacitor
wdfUnterminatedCap becomes wdf::Unterminated::Capacitor

[Maxime Coorevits]

Just a simple semantic question about the two variations of electrical components ( C, R, L ... ) ?

The daFX-16 paper talk about adapted/unadapted components where the current code name the classes as terminated/unterminated and in the same time getType return named string as adapted/unadapted.

In order to respect a clear semantic in the new organisation let me know what is the proper term to use.

[Maximilian Rest]

Let's stick with 'Adapted' and 'Unadapted'. Basically, I wanted to make a shift towards the terminated/unterminated wording as it is more clear from an electrical standpoint, but all the literature on WDFs uses (un-)adapted anyway and we should stick to that!

[Maxime Coorevits]

It's ok for me.