Update for Bootstrap 4

[mattlibera]

To address issue #120 ... This will update the log-viewer package to work with new Bootstrap 4. Changes include:

• updates to meta tags according to BS4 template
• replacing all glyphicons from BS3 with FontAwesome icons
• replacing datatables with new version that supports BS4
• small changes to layout for new BS4 column syntax
• changes to button that expands each row for BS4 styling and semantics
• updated jQuery for BS4

In addition to the stock changes to get BS4 working, I also propose some more CSS overrides to make the default layout more readable. BS4 uses rem = 16px as their base font size, as opposed to BS3 (14px), so things are larger by default. I added overrides for:

• .sidebar - smaller font, smaller line height, extra spacing at bottom for small viewport)
• entire #table-log node - get font back to ~14px base for the log table
• .btn - make the row-expand button font smaller (BS4 did away with the btn-xs class, so we need to compensate)

Other elements that are not as space-intensive (example, show X entries, search box, pagination, download/delete links) were left as-is, in the overall new BS4 larger font size.

Happy to discuss any of this if you would like!

[rap2hpoutre]

👏 BRAVO! Great PR: well explained, clean code, and I just tested it, it works and it's pretty. Thank you!

[mattlibera]

Thanks for the kind words! I'm glad it was helpful, and happy to have the chance to contribute.

Cheers - thanks for this package. It helps us a lot in our enterprise Laravel apps.

[amfsyn]

Why does it download from CDN instead of requiring them as dependencies?

[mattlibera]

Why does it download from CDN instead of requiring them as dependencies?

@amfsyn Not sure why you're asking this here. This isn't related to my PR; the view for this package has always utilized CDN.