Overhaul General Configuration. Tweak top navbar. Fix imdb and other ima...

...ges.

Change to rename General Configuration -> "Web Interface" tab as "Interface".
Add a "User Interface" section to the "Interface" tab.
Change consolidate "Date and Time" and "Theme" tab content to "User Interface" section.
Add field in Advanced setting for a custom remote name used to populate branch versions.
Change theme name "original" to "light".
Improve text wording on all UI options under General Configuration.
Improve reduce over use of capitals.
Improve streamline UI layout, mark-up and some CSS styling of all General Configuration tabs.
Fix default top navbar background white-out behaviour on browsers that don't support gradients.
Improve top navbar gradient use for greater cross browser compatibility (e.g. Safari).
Fix dark theme divider between Season numbers on display show page.
Fix main background and border colour of logs on log page.
Fix imdb and three other images rejected by IExplorer because they were corrupt. Turns out that they were .ico files renamed to either .gif or .png instead of being properly converted.
Fix "Subtitle Language" drop down font colour when entering text on the Subtitles Search settings.
Clean up text, correct quotations, use spaces for code lines, tabs for html.
Update changelog.