add tutorial pane

add localization for tutorial

add tutorial smartlines

tutorial fixes and refactoring

locale strings for tutorial button titles

tutorial second round edits

remove trailing whitespace
0.1.20
Merge pull request #256 from thomaspark/bug920723

Bug 920723 - Implement new tutorial functionality
0.1.21
[hotfix] anchors do not count towards mixed content

see https://bugzilla.mozilla.org/show_bug.cgi?id=928753
0.1.22
Corrected some spelling and grammar mistakes
added the flag to disable webrtc to the togetherjs view
Merge pull request #260 from igoryen/bug928970

Corrected some spelling and grammar mistakes
Merge pull request #262 from Pomax/bug928992

added the flag to disable webrtc to the togetherjs view