Refactor MacVim tests and add startup delayed full screen tests #1523
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Add test suite utility functions to set/restore defaults, adding/tearing down a new Vim window, making temp files, wait for full screen transition. This helps simplify per-test code and prevent mistakes.
Add new tests for delayed full screen on startup. This happens when a vimrc/gvimrc sets 'fullscreen' on startup and MacVim has to delay entering full screen until the window has been presented. This incidentally regression tests a bug (fixed in #1521) where simply having 'set fuopt= fullscreen' in a gvimrc would cause MacVim to crash on startup due to bad interaction with window resize messages.