Setup UX improvements

[jonathanstegall]

Is your feature request related to a problem? Please describe. When doing an initial install, just realizing some things that would make it nicer:

1. [ ] We should make a button or other functionality that users can use to choose the default for Salesforce values where there is a default, rather than having to type it, since it is what most users will want.
2. [x] If the plugin is already installed, we do the alert with the Salesforce API version; we should make a button to delete the option.
3. [ ] Pick a default value for Salesforce Field Display Value
4. [ ] Consider sending users from the initial Settings tab to the Authorize tab if they haven't authorized.
5. [ ] Consider sending them from Authorize to Fieldmap if there are no fieldmaps.
6. [ ] Consider sending them to the Scheduling tab if there are no schedule settings.
7. [ ] Consider setting default Log Settings or sending user there if there are no log settings.
8. [x] Debug mode should only have to be set on the main settings page. Debug log messages should not have to be separately enabled.

** for the Salesforce settings that have defaults**