Rename REQUIRE_DISCLOSURE license property into REQUIRE_DERIVATIVE_DISCLOSURE

`.0` and `.1` licenses require modifications to be disclosed, but do not limit derivative license schema.

Introduce `REQUIRE_MODIFICATIONS_DISCLOSURE` license property (containing the abovementioned licenses only).
These licenses read as follows:

```
1.3. "Covered Software" means (a) the Original Software, or (b) Modifications, or (c) the combination
     of files containing Original Software with files containing Modifications, in each case including portions thereof.

3.1. Availability of Source Code.
     Any Covered Software that You distribute or otherwise make available in Executable form
     must also be made available in Source Code form and that Source Code form must be distributed
     only under the terms of this License. You must include a copy of this License with every copy
     of the Source Code form of the Covered Software You distribute or otherwise make available.

3.6. Larger Works.
     You may create a Larger Work by combining Covered Software with other code not governed by
     the terms of this License and distribute the Larger Work as a single product. In such a case,
     You must make sure the requirements of this License are fulfilled for the Covered Software.

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