ENYO-2106: make packaging easier

1. Tested on OSX & Win7
1. Must come with associated update of plugins & package build scripts

* ENYO-2106: move ares-ide manual wrappers from plugin into ares-project
* ENYO-2106: rename ide.json into ide.plugin.json
* ENYO-2106: substitute `%PLUGINDIR%`
* ENYO-2106: globally use `myDir` instead of `__dirname`
* ENYO-2106: plugin depends on `%PLUGINDIR%`, not on `%INSTALLDIR%`

Enyo-DCO-1.1-Signed-off-by: Francois-Xavier KOWALSKI <francois-xavier.kowalski@hp.com>