contentModel.xml is automatically generated and can be safely ignored.

Source: https://rider-support.jetbrains.com/hc/en-us/community/posts/115000661950-A-lot-of-files-in-contentModel-xml?page=1#community_comment_115000538984

Add extra commented section to use when using Gradle or Maven auto-import.
These are mentioned in the original reference for optional excludes (https://intellij-support.jetbrains.com/hc/en-us/articles/206544839).
If this would be better as a separate, non-commented ignore file, let me know and I will resubmit.

.idea/misc.xml used to contain usage statistics.  This was broken out to usage.statistics.xml in the latest EAP (2018.2 EAP).  It should be excluded from git.

See https://youtrack.jetbrains.com/issue/IDEA-192913

ignore dbnavigator.xml

because it contains sensitive data, such as host, port, db, user name, and so on.

Microsoft was announced a new extension of installer for Windows. I just added that one to be ignored as default, like others installers files.
References:
https://blogs.windows.com/buildingapps/2018/03/07/three-things-need-know-windows-developer-day/
https://github.com/Microsoft/msix-packaging

This directory used by HTTP Client in IntelliJ IDEA (and other product).
https://www.jetbrains.com/help/idea/http-client-in-product-code-editor.html#viewingResponse

Since IDEA 14 (2014), IDEA and other contemporaneous JebBrains IDEs don't store sensitive info in `datasources.xml` and it makes sense to version control to share project data sources among the team. `dataSources.local.xml` is user-specific: contain usernames and could be sensitive from a security perspective, albeit passwords could be externalized to e.g. Mac Keychain.

References: https://intellij-support.jetbrains.com/hc/en-us/articles/206544839, https://youtrack.jetbrains.com/issue/IDEA-127105

On line 1, WebStorm is capitalized the same way as the other IDE names.

* Update Eclipse.gitignore

* Update Eclipse.gitignore

Added extensions for prepackaged app and toolbox file, pregenerated helpsearch folders.

`.autosave` does not match the name of autosave file generated by
simulink. A leading asterisk(*) is needed to match such name.

- Ignore all cmake build directories, not just debug.

**Reasons for making this change:**

Ignore the stack dump generated when a program has crashed under Windows.

**Links to documentation supporting these rule changes:** 

http://www.drupalonwindows.com/en/blog/git-shell-windows-reports-shexe-has-stopped-working-appcrash
https://community.atlassian.com/t5/SourceTree-questions/Sourcetree-cannot-clone-pull-anymore-sh-exe-stackdump/qaq-p/82962

From the Eclipse Documentation: "Make sure that the .project and .classpath files are under version control. These files must be stored in the repository so that other users checking out the projects for the first time will get the correct type of project and will get the correct Java build path." - http://wiki.eclipse.org/FAQ_How_do_I_set_up_a_Java_project_to_share_in_a_repository%3F