Fix inset of messageBubbleTopLabel when there is no avatar
disable send button when setting custom send button. fix #479
Merge pull request #495 from piercifani/fix-bubblelabel-allignment

Fix inset of messageBubbleTopLabel when there is no avatar
tweak #495
fix rendering and size calculations for custom fonts. close #490. close #489. close #407. close #347. credit @ghazel
fix unit tests
fix #498
bump version nums
Merge branch 'develop' into release-6.0