Beta 0.54.0

Another week, another release. This release again concentrates mostly on bug fixes with a lot of items squashed, here are the highlights:

• Fixed a segfault when clicking on the very left edge of Terminix (#143)
• Pasting with synchronized input now works as expected (#150)
• Shortcut preferences now shows "Control" instead of "Primary" (#138)
• Improvements to terminal re-sizing (#144)
• And a bunch of other miscellaneous bugs