[TIMOB-15623] Read properties from encrypted tiapp.json
[TIMOB-15623] Changed tiapp.xml json filename

Also added these properties to "listProperties" and "hasProperties". A debug log letting the developer know that these properties cannot be removed on "removeProperty" has also been added
[TIMOB-15623] Addressed comments in PR
[TIMOB-15623] Removed loadUserDefaults from TiApp.m
[TIMOB-15623] Addressed more comments
Merge pull request #4900 from pec1985/timob-15623

[TIMOB-15623] tiapp.xml secured and encrypted properties