Add near and far direction to the angle API

[FalkDresden]

Prior to release 0.3.2 the angle API used to draw near angles (<= 180deg) per default, drawing far angles (> 180 deg) only when inner was set to false. This behavior was changed by #729 for reasons mentioned in #712.

While this solves the problem for some cases, it creates new problems elsewhere. Because now if you want to explicitly draw near/far angles, you first have to manually calculate whether to use the direction "cw" or "ccw".

For this reason I propose to add two more directions:

• near: Behaves exactly like inner: true did in version 0.3.1
• far: Behaves exactly like inner: false did in version 0.3.1