Update for out of the OpenCPN source tree build

I made some updates for building the plugin out of the source tree of
OpenCPN with reference to the WMM plugin from Pavel.
Also some minor updates to get it running. I tested it on OSX and
Linux, but I don't have a Windows environment, so I didn't test it on
Windows.
For OSX the Layout files are not copied in the package, so you have to
manually get those.
I don't know if it would be possible to include those files in the
package, but I don't know enough about the Packages program how to do
that.
Merge result and add comment
Merge branch 'ptulp-master'
Update to README and .gitignore
Update README again
Some TODO items done
Merge pull request #1 from delatbabel/master

Latest updates
Added languages cs, da and tr_TR in the OSX package

The OSX package build didn’t include the  cd, da and tr_TR languages.
With this fix they will be.
Merge pull request #4 from ptulp/master

Added languages cs, da and tr_TR in the OSX build package
Updating README.md sections on installing additional files and binary distribution
Merge pull request #2 from delatbabel/master

Update
Update README file

Expanded OSX build info
Update README file

Another OSX build update
Merge pull request #5 from ptulp/master

Update README file for OSX build info
Merge translations with Crowdin
Update the Mac packaging project template to include all the Crowdin languages
Merge pull request #6 from nohal/crowdin

Crowdin translations integration
Enable in-the-tree build by renaming the bundled libraries conflicting with the core
Eliminate the installation of the Language files as it is not needed anymore.
Remove zip files from repo, add script to build them, change version numbering