Initial gitignore file for [Cadence Virtuoso](http://www.cadence.com/products/cic/Pages/default.aspx)
Cadence Virtuoso is a commercial EDA tool used for custom IC (ASIC) design. This gitignore file
blacklists database lock files, the contents of run directories for layout versus schematic and
design rule checks as well as log files for a selection of tools inside the package.

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

.ensime_cache is cache dir.

In addition to `.Spotlight-V100` and `.Trashes`, the following dotfiles
may appear at the root of all OSX volumes (not just external disks):

- `.DocumentRevisions-V100`: auto-save and versions storage
- `.fseventsd`: file system event storage
- `.Temporaryitems`: temp directory used by some applications instead of
                     /tmp and /var/tmp
- `.VolumeIcon.icns`: storage of custom icon for volume, if set

http://wiki.freepascal.org/File_extensions

Whether to use VCS or any other simulator is a choice of the individual designer rather than of the project as a whole.

template

Ignores all .rdb files, (default: dump.rdb).

These files contain a binary representation of the in-memory
redis data that is generated using cli tools or on a redis
failure.

They can be used to restore a redis db, and may contain
sensitive data so should not be saved in version control.

Continuation of https://github.com/github/gitignore/pull/594/ and details from http://support.microsoft.com/kb/211632