1.4.0-RC01

Release candidate 1 of version 1.4.0.

Changes from 1.4.0-beta01

• Fixed pull error message not being shown properly.
• Fixed pull from specific branch to use user's configuration instead of merge by default.
• Fixed branch checkout in side panel being executed in previous (after changing current tab).
• Improved performance of file system changes detection and SSH auth.
• Pushing branches set the tracking branch configuration if it wasn't set before.
• Added keybindings to interact with tabs. It is still in early phase so bindings may change before they are properly documented.
• Fixed theme not being changed properly until recomposition when switching between themes that have same value for "isLight" property.
• Reduced saturation of the builtin dark themes.
• Improved focus management. It fixes repo manual refresh not working when switching between tabs.
• Improved how closeable UI components can be closed by pressing ESC (includes file diff).