Added a shortcut to "Edit Transform", with Ctrl+E (lines 1191-1193).
Editing was very easy in OBS Classic, and I could not find the option
for stretching a source to bounds in OBS Studio, so the "Edit Transform"
dialogue should be more user-facing. Giving it a keyboard shortcut
denotes that it is important enough to have a shortcut, as opposed
to the myriad options with no shortcut
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