Add symlink resolver so we can figure out paths properly

We want the GitExecutablePath to reflect where the binary was found,
and the GitInstallPath to reflect where it is installed. When the
binary is a symlink (like /usr/local/bin/git -> ../Cellar/git/2.12.2/bin/git),
this means GitExecutablePath will have /usr/local/bin/git and
GitInstallPath will have /usr/local/Cellar/git/2.12.2/bin

Fixes #192

On non-windows, git and other files might be symlinks, so when
we're using them as a base for determining parent directories,
we may need to resolve the symlink first. The rules for automatically
doing symlink resolution are tricky, so for now just do it manually.

Fix opening a command line window on mac

Fixes #189

This reverts commit cac6b235.

Issue template: Correcting path to the debug log on a mac

Fix to not load the Keychain on application startup

Moving BaseWindow to it's own file for clarity's sake

Fixing UnityYAMLMerge path

Fix to set correct clone url based on environment os

UI and Functionality to Publish

Fixes to update name/email in Settings View

Fix 2017.x support

Add support for setting name and email when there is no repository yet.

When Unity restarts the serialized field is null, not empty, which can lead to CurrentDirectory being set to .

Unity 2017 has broken ABI compat on Texture2D.LoadImage by moving the
method from the Texture2D type to a separate class as an extension method.
Sigh.

Updating display correctly when the remote is removed

Merge remote-tracking branch 'remotes/origin/fixes/settings-view-git-remote-update' into fixes/name-email-update