Better PropertyNames

[bernardnormier]

We use config/PropertyNames.xml and its associated Python script to define all Ice-reserved properties, and to generate supporting code in C++, C#, Java, and JavaScript.

For example:

<section name="Ice">
        <property name="AcceptClassCycles" default="0" />
        <property name="Admin" class="objectadapter" />
        <property name="Admin.DelayCreation" default="0" />

is the beginning of the Ice.* reserved properties.

I propose we make the following improvements:

• for each property, specify the language(s) to which is applies as cpp, cs, java, js or all
  the current behavior is "all", which does not make sense for many properties, especially in js

• generate helper code to parse ObjectAdapter properties
  we currently duplicate this logic / list of properties in the various ObjectAdapter implementations, which is error-prone.