Added auto-generated tag files.

These files differ on Windows and OS X.

Anything matched by `*.un~` will also be matched by the last rule, `*~`.

Code Recommenders introduced in Eclipse Luna (4.5) creates a .recommenders directory at the root of the workspace, like .metadata

The server-auth-dir is where Emacs stores authentication files for Emacs
servers (running over TCP). These are (usually) ephemeral in nature, and
should be ignored.

Just added some comments. Some of us don't need some of the lines in the file.

On systems that require a lib64, virtualenv creates a symlink to the local lib.

Remove .gradle because it is not eclipse specific and already added in Gradle.gitignore.

Add ignore for STS's .springBeans file

Added a forgotten IDE to the .gitignore documentation.

Why?
For completeness and correctness

What?
[Webstorm](https://www.jetbrains.com/webstorm).

Since that is what it should be called now a days according to https://dev.twitter.com/fabric/android/integrating

https://ottoproject.io

Updated the tags ignore to include the .tags file. The main reason behind this is because Atom's symbols-view (https://atom.io/packages/symbols-view) supports tags/.tags/TAGS/.TAGS. Therefore, I thought it was a good idea to add the .tags/.TAGS to the ignore list.

Starting with 0.8.0, VS Code will store its settings in a .vscode folder and no longer in the generic .settings folder.

Official Documentation:
https://mercurial.selenic.com/wiki/FileFormats#Files_in_the_working_directory
https://mercurial.selenic.com/wiki/Subrepository
The specification for the .hg/ folder is simplified, see:
https://stackoverflow.com/a/15057742

which make it easier to find in search

some details based on #1221

This new version adds:
- fsdb waveforms
- simv.db.dir/ directory for VHDL top configs
- ucli.key
- vc_hdrs.h
- Also added a few comments about where each one of the files come from.

JetBrains recently released a new C/C++ IDE: CLion