more user-friendly turtledemo

[EvinLiang]

BPO	40056
Nosy	@terryjreedy
PRs	turtledemo enhancements #19145

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2020-03-24.20:15:15.955>
labels = ['type-feature', 'library', '3.9']
title = 'more user-friendly turtledemo'
updated_at = <Date 2020-05-24.11:37:19.410>
user = 'https://bugs.python.org/EvinLiang'

bugs.python.org fields:

activity = <Date 2020-05-24.11:37:19.410>
actor = 'terry.reedy'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2020-03-24.20:15:15.955>
creator = 'Evin Liang'
dependencies = []
files = []
hgrepos = []
issue_num = 40056
keywords = []
message_count = 3.0
messages = ['364961', '365234', '369792']
nosy_count = 2.0
nosy_names = ['terry.reedy', 'Evin Liang']
pr_nums = ['19145']
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue40056'
versions = ['Python 3.9']

[EvinLiang]

[minor]

1. Display underscores as spaces in menu bar
2. Allow user to run custom code

[terryjreedy]

Enhancements are not usually backported.

1. The underscores are in entries such as 'minimal_hanoi' in the Examples drop-down submenu. Changing to spaces should not hurt anything.

2. Already possible (maybe): Help => Turtledemo help has
   (2) How to add your own demos to the demo repository
   which discusses requirements for turtle code run in the demo framework. (However, users may not be able to add files to the turtledemo directory -- Demo/turtle in 2.x, Lib/turtledemo in 3.x.) Any alternative should direct users to these requirements.

What is your proposed alternative mechanism? Why is it better than a user copying __main__.py and turtle.cfg into their own directory of turtle scripts? (Perhaps this option should also be mentioned as
(3) How to add turtledemo to your directory.)