Direct Guider Implementation - Dither without guiding

What is the purpose of this Pull Request?

Implement a new Direct Guider, capable only of dithering, but that doesn’t require a guide camera. Dithering is done via PulseGuide commands to the mount of a user-specified duration.

Changes include:

• Amending UI to add a Pulse Duration parameter, as well as rename PHD2 Settings to Guider Settings

• Implementing GuideDirections enum and PulseGuide in AscomTelescope.cs

• Passing TelescopeMediator object from ApplicationVM -> GuiderVM -> GuiderChooserVM -> New "Direct Guider" guide class.

• New Direct Guider class uses telescope connection to send dither PulseGuide commands in random directions

• Direct Guider attempts to connect to telescope when connected

How were the changes tested?

Changes tested on Simulators (EQMOD and .NET Telescope Simulator) as well as physical mounts (EQ6-R and Vixen AXJ).

Tests performed:

• Direct Guider attempts to connect Telescope if not yet connected. Succeeds properly. Fails gracefully.

• Direct Guider disconnects if Telescope disconnected.

• When Direct Guider is enabled and dithering is enabled, pulse guide commands move the mount in random direction within the PulseGuide duration set by user

• Changing PulseGuide duration, SettleTime, and RAOnly parameters properly affected the dithering commands as expected

• Connect All button works with Direct Guider

• PHD2 integration still working

Are there relevant Issues in the tracker that this PR will fix?

Issue #88 https://bitbucket.org/Isbeorn/nina/issues/88/dither-without-phd2

Screenshots

Notes

German labels are in English :)