Reduce IConvertableToPath and String used for properties to a single common type

[homedirectory]

Description

Paths of entity properties can be represented in 2 ways:

• via the traditional String
• via the compile-time safe IConvertableToPath

Due to the existence of 2 separate representations, it has been necessary to create 2 respective method signatures whenever the method needed to accept property paths as arguments.

It is proposed to eliminate this necessity by reducing these 2 types to a single common type that can represent property paths: java.lang.CharSequence.
Since String already implements CharSequence, this will only require IConvertableToPath to implement CharSequence.

This API change will also require recompilation of additional dependencies beside the TG applications, such as JMC.

Expected outcome

Method signatures declaring parameter types String and IConvertableToPath that represent properties are reduced to a single signature declaring CharSequence.