Revert "related #1937 adding support for the validator (will break not updated plugins)"

This reverts commit d099a0ce6d87e7d27cead45245664defda129099.

Conflicts:
	src/domogik/common/packagejson.py
Revert "Work on #1937 : doc update related to previous rename actions commits"

This reverts commit af18d8e2348a8875a270777fe9da7b9fb0db7c17.

Conflicts:
	docs/package_development/plugins/json/device_types.txt
	docs/package_development/plugins/json/sample.txt
Revert "Work on #1937 : rename all DeviceType as InstanceType"

This reverts commit b15a5f1d68f038470df7bf7cded516b2aaa431df.
Revert "Work on #1937 : rename all device type as instance type"

This reverts commit de928098fa184adfb884c0496a5a7f61e06b1742.
Revert "Work on #1937 : rename all device_type as instance_type"

This reverts commit 6d367c7cf767d2359a2765b3424da5ba2ebb01ff.

Conflicts:
	src/domogik/common/packagejson.py