common: add more references to constants' origin

classify constants into these 5 types

* constants for xrdp
* constants come from ITU-T Recommendations
* constants come from Remote Desktop Protocol
* constants come from other MS products
* unclassified yet
This commit is contained in:
Koichiro IWAO 2017-11-22 18:08:40 +09:00 committed by metalefty
parent 799c230998
commit 3de3a4fab5

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