All temporary directory start with `flutter_` and have their random component separated from the name by a period, as in `flutter_test_bundle.YFYQMY`.
I've tried to find some of the places where we didn't cleanly delete temporary directories, too. This greatly reduces, though it does not entirely eliminate, the directories we leave behind when running tests, especially `flutter_tools` tests.
While I was at it I standardized on `tempDir` as the variable name for temporary directories, since it was the most common, removing occurrences of `temp` and `tmp`, among others.
Also I factored out some common code that used to catch exceptions that happen on Windows, and made more places use that pattern.
* Upgrade everything except matcher.
* Roll matcher (and test)
* Adjust tests that depend on flutter:test directly to depend on a shim
* Require use of package:test shim and remove other references to package:test
Creates a new (hidden) flutter command 'ide-config' that will create and/or update
existing .iml files and some files under the .idea directory, as well as
removing existing *.iml files and the .idea directory.
It also:
* Adds *.iml to the .gitignore
* Removes existing .iml files from the repo, and moves them to the
packages/flutter_tools/ide_templates/intellij directory.
* Adds a flag to ide-config ('--update-templates') that will take any new .iml
files in the flutter tree and add them to the existing templates.
- If --overwrite is also specified, then all existing templates will also
be overwritten with the contents from the flutter tree, and any that have
been deleted from the flutter tree will also be removed from the
templates.
* Added new run configurations for all existing app targets that will now also
be automatically added to IntelliJ.
* Setting up the environment also includes setting the coding style guidelines
and the git VCS.
* Note that after this PR lands, Flutter developers will need to run it once to
re-create the .iml files and configuration files that have been removed.
After this PR lands, .iml files will no longer appear in the untracked files
section for git.
