Revert "Added IntelliJ project files."

This reverts commit b29cffbd985f97c00bdc3b05c08932d93b4fbc86.
Revert "Added IntelliJ project."

This reverts commit 42a8b97e8e53e8fef0ebef725d773683db59bce3.
Merge branch 'project-customization' into all-extensions

Conflicts:
	parent.ipr
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