XPCDictionary: add `get_value()` and `set_value()` #1206

	# This workflow will install Python dependencies, run tests and lint with a single version of Python
	# For more information see: https://help.github.com/actions/language-and-framework-guides/using-python-with-github-actions

	name: Python application

	on:
	push:
	branches: [ '**' ]

	jobs:
	build:
	runs-on: ${{ matrix.os }}

	defaults:
	run:
	working-directory: ./src/rpcclient

	strategy:
	matrix:
	python-version: [ 3.8, 3.9, "3.10", 3.11 ]
	os: [ ubuntu-latest, macos-latest, windows-latest ]

	steps:
	- uses: actions/checkout@v3
	- name: Set up Python ${{ matrix.python-version }}
	uses: actions/setup-python@v4
	with:
	python-version: ${{ matrix.python-version }}
	- name: Lint with flake8
	run: \|
	python -m pip install flake8
	flake8 . --max-complexity=14 --max-line-length=127 --statistics
	- name: Verify sorted imports
	run: \|
	python -m pip install isort
	isort . -m HANGING_INDENT -l 120 --check-only
	- name: Test install
	run: \|
	python -m pip install --upgrade pip
	python -m pip install -U .
	- name: Test show usage
	run: \|
	python -m rpcclient --help

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