AdminPanel: Improve character creation and editing

[sven-n]

Is your feature request related to a problem? Please describe.
When creating or editing a character, a lot of additional objects need to be created to make it functional. The user interface is a bit hard if you don't know about the internal data structures.
For example, editing stat values requires to know that there is an stat attributes collection.

Describe the solution you'd like
A more intiutive UI and automatic initialization of the required objects.
It should initialize the same data as the game logic when creating a character in-game.

[nitoygo]

To add to this, when I edit and save a character using the admin panel editor, then update it in the game client and exit game, going back to the edit character still shows the old state (before doing anything in game), and not the state after exiting the game.

For example, I added remaining 1000 level up points in Admin Panel, then consume that 1000 points in game, going back to admin panel, the 1000 points still show up. Same for items.