`invalid settings` error when using with gef-extras

* [x] Did you use the latest version of GEF from `dev` branch?
* [x] Is your bug specific to GEF (not GDB)? - Try to reproduce it running `gdb -nx`
* [x] Did you read the [documentation](https://gef.readthedocs.org/en/latest/) first?
* [x] Did you check [issues](https://github.com/hugsy/gef/issues) (including
  the closed ones) - and the [PR](https://github.com/hugsy/gef/pulls)?


### Step 1: Describe your environment
* GEF version (including the Python library version) run `version` in GEF.
```
GEF: rev:6508a99f91bf7cdd2f1ea5af6fb2d4921d42a669 (Git - clean)
SHA256(/home/XXXX/gef/gef.py): 6b115fcaac5ff2748ce785f1be12c0445fbcd64d3fdca2b23ebfb279afdec997
GDB: 9.2
GDB-Python: 3.8
```

### Step 2: Describe your problem

There are bunch of errors after any change in configration when use `gef` with `gef-extras` .
```
GEF for linux ready, type `gef' to start, `gef config' to configure
96 commands loaded for GDB 9.2 using Python engine 3.8
[*] Invalid setting 'gef.use-windbg-prompt': 'gef.use-windbg-prompt'
[*] Invalid setting 'ida-rpyc.host': 'ida-rpyc.host'
[*] Invalid setting 'ida-rpyc.port': 'ida-rpyc.port'
[*] Invalid setting 'ida-rpyc.sync_cursor': 'ida-rpyc.sync_cursor'
[*] Invalid setting 'retdec.path': 'retdec.path'
[*] Invalid setting 'retdec.retdec_path': 'retdec.retdec_path'
[*] Invalid setting 'retdec.theme': 'retdec.theme'
[*] Invalid setting 'rpyc-remote.host': 'rpyc-remote.host'
[*] Invalid setting 'rpyc-remote.port': 'rpyc-remote.port'
[*] Invalid setting 'vereference.max_recursion': 'vereference.max_recursion'
[+] Configuration from '/home/XXXXX/.gef.rc' restored
[+] 34 extra commands added from '/home/XXXXX/.config/gef-extras/scripts'
```

#### Steps to reproduce

1. install gef dev
2. install gef-extras dev
3. run `gdb`
4. gef save --> this will add settings related to the gef-extras to .gef.rc
5. exit
6. run `gdb`

#### Traces
opening `gef debug` won't change output

#### Thoughts
I think these error occur due to [L10255][1] in `GefCommand's setup function`.  `__load_extra_plugins()` executed after `gdb.execute("gef restore")` so there are invalid keys in config at [L10615][2]. 
<del> When I change order, or commented  [L10255][1]  out errors doesn't occur again.</del>  Changing order not solves issue, it just removes all configuration. 

[1]: https://github.com/hugsy/gef/blob/18c7ba486e31f73cd6f8432befa0658e19f0527d/gef.py#L10255
https://github.com/hugsy/gef/blob/18c7ba486e31f73cd6f8432befa0658e19f0527d/gef.py#L10254-L10264

[2]: https://github.com/hugsy/gef/blob/18c7ba486e31f73cd6f8432befa0658e19f0527d/gef.py#L10615
https://github.com/hugsy/gef/blob/18c7ba486e31f73cd6f8432befa0658e19f0527d/gef.py#L10614-L10618

	# load the saved settings
	gdb.execute("gef restore")

	# restore the autosave/autoreload breakpoints policy (if any)
	self.__reload_auto_breakpoints()

	# load plugins from `extra_plugins_dir`
	if self.__load_extra_plugins() > 0:
	# if here, at least one extra plugin was loaded, so we need to restore
	# the settings once more
	gdb.execute("gef restore quiet")

	try:
	setting = gef.config.raw_entry(key)
	except Exception as e:
	warn(f"Invalid setting '{key}': {e}")
	continue

Provide feedback

Saved searches

Use saved searches to filter your results more quickly

Uh oh!

Uh oh!

`invalid settings` error when using with gef-extras #823

Step 1: Describe your environment

Step 2: Describe your problem

Steps to reproduce

Traces

Thoughts

Metadata

Assignees

Labels

Projects

Milestone

Relationships

Development

Uh oh!

invalid settings error when using with gef-extras #823

Description

Step 1: Describe your environment

Step 2: Describe your problem

Steps to reproduce

Traces

Thoughts

Metadata

Metadata

Assignees

Labels

Projects

Milestone

Relationships

Development

Issue actions

`invalid settings` error when using with gef-extras #823